Cannot set LC_CTYPE to default locale

Please start by running steps 1 to 6 of https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure and paste all output into this question document that you already created.

madhu@madhu-desktop:~$ ubuntu-support-status
Traceback (most recent call last):
  File "/usr/bin/ubuntu-support-status", line 120, in <module>
    (still_supported, support_str) = get_maintenance_status(cache, pkg.name, support_tag)
  File "/usr/bin/ubuntu-support-status", line 41, in get_maintenance_status
    raise Exception("No date tag found")
Exception: No date tag found
madhu@madhu-desktop:~$ sudo grep -R proxy /etc/apt/*
[sudo] password for madhu:
Sorry, try again.
[sudo] password for madhu:
madhu@madhu-desktop:~$ grep proxy /etc/environment
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$ echo $http_proxy

madhu@madhu-desktop:~$ echo $ftp_proxy

madhu@madhu-desktop:~$ grep proxy /etc/bash.bashrc
madhu@madhu-desktop:~$ grep proxy ~/.bashrc
madhu@madhu-desktop:~$ cat /etc/apt/apt.conf
cat: /etc/apt/apt.conf: No such file or directory
madhu@madhu-desktop:~$ sudo fuser -vvv /var/lib/dpkg/lock
madhu@madhu-desktop:~$ sudo fuser -vvv /var/cache/apt/archives/lock
madhu@madhu-desktop:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.3 LTS"
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$ uname -a
Linux madhu-desktop 3.2.0-57-generic-pae #87-Ubuntu SMP Tue Nov 12 21:57:43 UTC 2013 i686 i686 i386 GNU/Linux
madhu@madhu-desktop:~$ sudo rm /var/lib/apt/lists/lock
madhu@madhu-desktop:~$ sudo rm /var/cache/apt/archives/lock
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$ sudo rm /var/lib/dpkg/lock
madhu@madhu-desktop:~$ sudo cp -arf /var/lib/dpkg /var/lib/dpkg.backup

sudo mv /var/lib/dpkg/status /var/lib/dpkg/status-bad
sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status || sudo cp /var/backups/apt.extended_states.0 /var/lib/dpkg/status
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$ sudo mv /var/lib/dpkg/status /var/lib/dpkg/status-bad
madhu@madhu-desktop:~$ sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status || sudo cp /var/backups/apt.extended_states.0 /var/lib/dpkg/status
madhu@madhu-desktop:~$ sudo mv /var/lib/dpkg/available /var/lib/dpkg/available-bad
madhu@madhu-desktop:~$ sudo cp /var/lib/dpkg/available-old /var/lib/dpkg/available
madhu@madhu-desktop:~$ sudo rm -rf /var/lib/dpkg/updates/*
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$
madhu@madhu-desktop:~$ sudo rm -rf /var/lib/apt/lists
madhu@madhu-desktop:~$ sudo rm /var/cache/apt/*.bin
madhu@madhu-desktop:~$ sudo mkdir /var/lib/apt/lists
madhu@madhu-desktop:~$ sudo mkdir /var/lib/apt/lists/partial
madhu@madhu-desktop:~$ LANG=C;sudo apt-get clean
madhu@madhu-desktop:~$ LANG=C;sudo apt-get autoclean
Reading package lists... Done
Building dependency tree
Reading state information... Done
madhu@madhu-desktop:~$ LANG=C;sudo apt-get --purge autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
46 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up libavahi-common-data (0.6.30-5ubuntu2.1) ...
Setting up libavahi-common3 (0.6.30-5ubuntu2.1) ...
Setting up libavahi-client3 (0.6.30-5ubuntu2.1) ...
Setting up libavahi-core7 (0.6.30-5ubuntu2.1) ...
Setting up libavahi-glib1 (0.6.30-5ubuntu2.1) ...
Setting up libavahi-gobject0 (0.6.30-5ubuntu2.1) ...
Setting up libavahi-ui-gtk3-0 (0.6.30-5ubuntu2.1) ...
Setting up libcurl3 (7.22.0-3ubuntu4.6) ...
Setting up libcurl3-gnutls (7.22.0-3ubuntu4.6) ...
Setting up libnss3 (3.15.3.1-0ubuntu0.12.04.1) ...
Setting up libcurl3-nss (7.22.0-3ubuntu4.6) ...
Setting up libjpeg-turbo8 (1.1.90+svn733-0ubuntu4.3) ...
Setting up libqtcore4 (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-xml (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-dbus (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-network (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-sql (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-script (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-xmlpatterns (4:4.8.1-0ubuntu4.5) ...
Setting up qdbus (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-sql-mysql (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-sql-sqlite (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-test (4:4.8.1-0ubuntu4.5) ...
Setting up libaccountsservice0 (0.6.15-2ubuntu9.7) ...
Setting up accountsservice (0.6.15-2ubuntu9.7) ...
Setting up avahi-autoipd (0.6.30-5ubuntu2.1) ...
Setting up avahi-daemon (0.6.30-5ubuntu2.1) ...
Setting up avahi-utils (0.6.30-5ubuntu2.1) ...
Setting up gir1.2-accountsservice-1.0 (0.6.15-2ubuntu9.7) ...
Setting up gnome-desktop3-data (3.4.2-0ubuntu0.2) ...
Setting up grub-common (1.99-21ubuntu3.14) ...
Setting up grub2-common (1.99-21ubuntu3.14) ...
Setting up grub-pc-bin (1.99-21ubuntu3.14) ...
Setting up grub-pc (1.99-21ubuntu3.14) ...
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.)
debconf: falling back to frontend: Readline
Installation finished. No error reported.
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.2.0-57-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-57-generic-pae
Found memtest86+ image: /boot/memtest86+.bin
done
Setting up libdjvulibre-text (3.5.24-9ubuntu0.1) ...
Setting up libdjvulibre21 (3.5.24-9ubuntu0.1) ...
Setting up libgnome-desktop-3-2 (3.4.2-0ubuntu0.2) ...
Setting up libnss3-1d (3.15.3.1-0ubuntu0.12.04.1) ...
Setting up libqtgui4 (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-help (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-designer (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-opengl (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-qt3support (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-scripttools (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-svg (4:4.8.1-0ubuntu4.5) ...
Setting up libqt4-declarative (4:4.8.1-0ubuntu4.5) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
madhu@madhu-desktop:~$ LANG=C;sudo apt-get --fix-missing update -o APT::Cache-Limit=100000000
Get:1 http://archive.ubuntu.com precise Release.gpg [198 B]
Get:2 http://archive.ubuntu.com precise-updates Release.gpg [198 B]
Get:3 http://archive.ubuntu.com precise-security Release.gpg [198 B]
Get:4 http://archive.ubuntu.com precise Release [49.6 kB]
Get:5 http://archive.ubuntu.com precise-updates Release [49.6 kB]
Get:6 http://archive.ubuntu.com precise-security Release [49.6 kB]
Get:7 http://archive.ubuntu.com precise/main Sources [934 kB]
Get:8 http://archive.ubuntu.com precise/restricted Sources [5470 B]
Get:9 http://archive.ubuntu.com precise/universe Sources [5019 kB]
Get:10 http://archive.ubuntu.com precise/multiverse Sources [155 kB]
Get:11 http://archive.ubuntu.com precise/main i386 Packages [1274 kB]
Get:12 http://archive.ubuntu.com precise/restricted i386 Packages [8431 B]
Get:13 http://archive.ubuntu.com precise/universe i386 Packages [4796 kB]
Get:14 http://archive.ubuntu.com precise/multiverse i386 Packages [121 kB]
Get:15 http://archive.ubuntu.com precise/main TranslationIndex [3706 B]
Get:16 http://archive.ubuntu.com precise/multiverse TranslationIndex [2676 B]
Get:17 http://archive.ubuntu.com precise/restricted TranslationIndex [2596 B]
Get:18 http://archive.ubuntu.com precise/universe TranslationIndex [2922 B]
Get:19 http://archive.ubuntu.com precise-updates/main Sources [430 kB]
Get:20 http://archive.ubuntu.com precise-updates/restricted Sources [7039 B]
Get:21 http://archive.ubuntu.com precise-updates/universe Sources [101 kB]
Get:22 http://archive.ubuntu.com precise-updates/multiverse Sources [8468 B]
Get:23 http://archive.ubuntu.com precise-updates/main i386 Packages [747 kB]
Get:24 http://archive.ubuntu.com precise-updates/restricted i386 Packages [11.5 kB]
Get:25 http://archive.ubuntu.com precise-updates/universe i386 Packages [230 kB]
Get:26 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [14.4 kB]
Get:27 http://archive.ubuntu.com precise-updates/main TranslationIndex [3564 B]
Get:28 http://archive.ubuntu.com precise-updates/multiverse TranslationIndex [2605 B]
Get:29 http://archive.ubuntu.com precise-updates/restricted TranslationIndex [2461 B]
Get:30 http://archive.ubuntu.com precise-updates/universe TranslationIndex [2850 B]
Get:31 http://archive.ubuntu.com precise-security/main Sources [94.7 kB]
Get:32 http://archive.ubuntu.com precise-security/restricted Sources [2494 B]
Get:33 http://archive.ubuntu.com precise-security/universe Sources [29.9 kB]
Get:34 http://archive.ubuntu.com precise-security/multiverse Sources [1792 B]
Get:35 http://archive.ubuntu.com precise-security/main i386 Packages [375 kB]
Get:36 http://archive.ubuntu.com precise-security/restricted i386 Packages [4620 B]
Get:37 http://archive.ubuntu.com precise-security/universe i386 Packages [91.1 kB]
Get:38 http://archive.ubuntu.com precise-security/multiverse i386 Packages [2642 B]
Get:39 http://archive.ubuntu.com precise-security/main TranslationIndex [74 B]
Get:40 http://archive.ubuntu.com precise-security/multiverse TranslationIndex [72 B]
Get:41 http://archive.ubuntu.com precise-security/restricted TranslationIndex [72 B]
Get:42 http://archive.ubuntu.com precise-security/universe TranslationIndex [73 B]
Get:43 http://archive.ubuntu.com precise/main Translation-en [726 kB]
Get:44 http://archive.ubuntu.com precise/multiverse Translation-en [93.4 kB]
Get:45 http://archive.ubuntu.com precise/restricted Translation-en [2395 B]
Get:46 http://archive.ubuntu.com precise/universe Translation-en [3341 kB]
Get:47 http://archive.ubuntu.com precise-updates/main Translation-en [326 kB]
Get:48 http://archive.ubuntu.com precise-updates/multiverse Translation-en [8293 B]
Get:49 http://archive.ubuntu.com precise-updates/restricted Translation-en [2663 B]
Get:50 http://archive.ubuntu.com precise-updates/universe Translation-en [133 kB]
Get:51 http://archive.ubuntu.com precise-security/main Translation-en [165 kB]
Get:52 http://archive.ubuntu.com precise-security/multiverse Translation-en [1299 B]
Get:53 http://archive.ubuntu.com precise-security/restricted Translation-en [1253 B]
Get:54 http://archive.ubuntu.com precise-security/universe Translation-en [54.8 kB]
Fetched 19.5 MB in 1min 50s (177 kB/s)
Reading package lists... Done
madhu@madhu-desktop:~$ sudo dpkg --configure -a
madhu@madhu-desktop:~$ sudo dpkg --clear-avail
madhu@madhu-desktop:~$ LANG=C;sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
madhu@madhu-desktop:~$ LANG=C;sudo apt-get --fix-missing install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
madhu@madhu-desktop:~$ LANG=C;sudo apt-get update -o APT::Cache-Limit=100000000 && sudo apt-get dist-upgrade
Hit http://archive.ubuntu.com precise Release.gpg
Get:1 http://archive.ubuntu.com precise-updates Release.gpg [198 B]
Get:2 http://archive.ubuntu.com precise-security Release.gpg [198 B]
Hit http://archive.ubuntu.com precise Release
Get:3 http://archive.ubuntu.com precise-updates Release [49.6 kB]
Get:4 http://archive.ubuntu.com precise-security Release [49.6 kB]
Hit http://archive.ubuntu.com precise/main Sources
Hit http://archive.ubuntu.com precise/restricted Sources
Hit http://archive.ubuntu.com precise/universe Sources
Hit http://archive.ubuntu.com precise/multiverse Sources
Hit http://archive.ubuntu.com precise/main i386 Packages
Hit http://archive.ubuntu.com precise/restricted i386 Packages
Hit http://archive.ubuntu.com precise/universe i386 Packages
Hit http://archive.ubuntu.com precise/multiverse i386 Packages
Hit http://archive.ubuntu.com precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise/restricted TranslationIndex
Hit http://archive.ubuntu.com precise/universe TranslationIndex
Get:5 http://archive.ubuntu.com precise-updates/main Sources [430 kB]
Get:6 http://archive.ubuntu.com precise-updates/restricted Sources [7039 B]
Get:7 http://archive.ubuntu.com precise-updates/universe Sources [101 kB]
Get:8 http://archive.ubuntu.com precise-updates/multiverse Sources [8468 B]
Get:9 http://archive.ubuntu.com precise-updates/main i386 Packages [747 kB]
Get:10 http://archive.ubuntu.com precise-updates/restricted i386 Packages [11.5 kB]
Get:11 http://archive.ubuntu.com precise-updates/universe i386 Packages [230 kB]
Get:12 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [14.4 kB]
Hit http://archive.ubuntu.com precise-updates/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-updates/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex
Get:13 http://archive.ubuntu.com precise-security/main Sources [94.7 kB]
Get:14 http://archive.ubuntu.com precise-security/restricted Sources [2494 B]
Get:15 http://archive.ubuntu.com precise-security/universe Sources [29.9 kB]
Get:16 http://archive.ubuntu.com precise-security/multiverse Sources [1792 B]
Get:17 http://archive.ubuntu.com precise-security/main i386 Packages [375 kB]
Get:18 http://archive.ubuntu.com precise-security/restricted i386 Packages [4620 B]
Get:19 http://archive.ubuntu.com precise-security/universe i386 Packages [91.1 kB]
Get:20 http://archive.ubuntu.com precise-security/multiverse i386 Packages [2642 B]
Hit http://archive.ubuntu.com precise-security/main TranslationIndex
Hit http://archive.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-security/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-security/universe TranslationIndex
Hit http://archive.ubuntu.com precise/main Translation-en
Hit http://archive.ubuntu.com precise/multiverse Translation-en
Hit http://archive.ubuntu.com precise/restricted Translation-en
Hit http://archive.ubuntu.com precise/universe Translation-en
Hit http://archive.ubuntu.com precise-updates/main Translation-en
Hit http://archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://archive.ubuntu.com precise-updates/universe Translation-en
Hit http://archive.ubuntu.com precise-security/main Translation-en
Hit http://archive.ubuntu.com precise-security/multiverse Translation-en
Hit http://archive.ubuntu.com precise-security/restricted Translation-en
Hit http://archive.ubuntu.com precise-security/universe Translation-en
Fetched 2250 kB in 17s (126 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-headers-3.2.0-58 linux-headers-3.2.0-58-generic-pae
  linux-image-3.2.0-58-generic-pae
The following packages will be upgraded:
  linux-generic-pae linux-headers-generic-pae linux-image-generic-pae
  linux-libc-dev
4 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 51.8 MB of archives.
After this operation, 181 MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Get:1 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-image-3.2.0-58-generic-pae i386 3.2.0-58.88 [38.3 MB]
Get:2 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-generic-pae i386 3.2.0.58.69 [1728 B]
Get:3 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-image-generic-pae i386 3.2.0.58.69 [2368 B]
Get:4 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-headers-3.2.0-58 all 3.2.0-58.88 [11.7 MB]
Get:5 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-headers-3.2.0-58-generic-pae i386 3.2.0-58.88 [978 kB]
Get:6 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-headers-generic-pae i386 3.2.0.58.69 [2364 B]
Get:7 http://archive.ubuntu.com/ubuntu/ precise-updates/main linux-libc-dev i386 3.2.0-58.88 [860 kB]
Fetched 51.8 MB in 17min 31s (49.3 kB/s)
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.)
debconf: falling back to frontend: Readline
Selecting previously unselected package linux-image-3.2.0-58-generic-pae.
(Reading database ... 830693 files and directories currently installed.)
Unpacking linux-image-3.2.0-58-generic-pae (from .../linux-image-3.2.0-58-generic-pae_3.2.0-58.88_i386.deb) ...
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.)
debconf: falling back to frontend: Readline
Done.
Preparing to replace linux-generic-pae 3.2.0.57.68 (using .../linux-generic-pae_3.2.0.58.69_i386.deb) ...
Unpacking replacement linux-generic-pae ...
Preparing to replace linux-image-generic-pae 3.2.0.57.68 (using .../linux-image-generic-pae_3.2.0.58.69_i386.deb) ...
Unpacking replacement linux-image-generic-pae ...
Selecting previously unselected package linux-headers-3.2.0-58.
Unpacking linux-headers-3.2.0-58 (from .../linux-headers-3.2.0-58_3.2.0-58.88_all.deb) ...
Selecting previously unselected package linux-headers-3.2.0-58-generic-pae.
Unpacking linux-headers-3.2.0-58-generic-pae (from .../linux-headers-3.2.0-58-generic-pae_3.2.0-58.88_i386.deb) ...
Preparing to replace linux-headers-generic-pae 3.2.0.57.68 (using .../linux-headers-generic-pae_3.2.0.58.69_i386.deb) ...
Unpacking replacement linux-headers-generic-pae ...
Preparing to replace linux-libc-dev 3.2.0-57.87 (using .../linux-libc-dev_3.2.0-58.88_i386.deb) ...
Unpacking replacement linux-libc-dev ...
Setting up linux-image-3.2.0-58-generic-pae (3.2.0-58.88) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.2.0-58-generic-pae /boot/vmlinuz-3.2.0-58-generic-pae
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.2.0-58-generic-pae /boot/vmlinuz-3.2.0-58-generic-pae
update-initramfs: Generating /boot/initrd.img-3.2.0-58-generic-pae
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.2.0-58-generic-pae /boot/vmlinuz-3.2.0-58-generic-pae
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.2.0-58-generic-pae /boot/vmlinuz-3.2.0-58-generic-pae
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.2.0-58-generic-pae /boot/vmlinuz-3.2.0-58-generic-pae
Generating grub.cfg ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.2.0-58-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-58-generic-pae
Found linux image: /boot/vmlinuz-3.2.0-57-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-57-generic-pae
Found memtest86+ image: /boot/memtest86+.bin
done
Setting up linux-image-generic-pae (3.2.0.58.69) ...
Setting up linux-headers-3.2.0-58 (3.2.0-58.88) ...
Setting up linux-headers-3.2.0-58-generic-pae (3.2.0-58.88) ...
Setting up linux-headers-generic-pae (3.2.0.58.69) ...
Setting up linux-generic-pae (3.2.0.58.69) ...
Setting up linux-libc-dev (3.2.0-58.88) ...
madhu@madhu-desktop:~$ find /etc/apt -name '*.list' -exec bash -c 'echo -e "\n$1\n"; cat -n "$1"' _ '{}' \;

/etc/apt/sources.list.d/precise-partner.list

     1 # deb http://archive.canonical.com/ubuntu precise partner #Added by software-center

/etc/apt/sources.list.d/dr3mro-nautilus-actions-extra-precise.list

/etc/apt/sources.list

     1 # deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
     2
     3 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
     4 # newer versions of the distribution.
     5 deb http://archive.ubuntu.com/ubuntu precise main restricted
     6 deb-src http://archive.ubuntu.com/ubuntu precise main restricted
     7
     8 ## Major bug fix updates produced after the final release of the
     9 ## distribution.
    10 deb http://archive.ubuntu.com/ubuntu precise-updates main restricted
    11 deb-src http://archive.ubuntu.com/ubuntu precise-updates main restricted
    12
    13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
    14 ## team. Also, please note that software in universe WILL NOT receive any
    15 ## review or updates from the Ubuntu security team.
    16 deb http://archive.ubuntu.com/ubuntu precise universe
    17 deb-src http://archive.ubuntu.com/ubuntu precise universe
    18 deb http://archive.ubuntu.com/ubuntu precise-updates universe
    19 deb-src http://archive.ubuntu.com/ubuntu precise-updates universe
    20
    21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
    22 ## team, and may not be under a free licence. Please satisfy yourself as to
    23 ## your rights to use the software. Also, please note that software in
    24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
    25 ## security team.
    26 deb http://archive.ubuntu.com/ubuntu precise multiverse
    27 deb-src http://archive.ubuntu.com/ubuntu precise multiverse
    28 deb http://archive.ubuntu.com/ubuntu precise-updates multiverse
    29 deb-src http://archive.ubuntu.com/ubuntu precise-updates multiverse
    30
    31 ## N.B. software from this repository may not have been tested as
    32 ## extensively as that contained in the main release, although it includes
    33 ## newer versions of some applications which may provide useful features.
    34 ## Also, please note that software in backports WILL NOT receive any review
    35 ## or updates from the Ubuntu security team.
    36
    37 deb http://archive.ubuntu.com/ubuntu precise-security main restricted
    38 deb-src http://archive.ubuntu.com/ubuntu precise-security main restricted
    39 deb http://archive.ubuntu.com/ubuntu precise-security universe
    40 deb-src http://archive.ubuntu.com/ubuntu precise-security universe
    41 deb http://archive.ubuntu.com/ubuntu precise-security multiverse
    42 deb-src http://archive.ubuntu.com/ubuntu precise-security multiverse
    43
    44 ## Uncomment the following two lines to add software from Canonical's
    45 ## 'partner' repository.
    46 ## This software is not part of Ubuntu, but is offered by Canonical and the
    47 ## respective vendors as a service to Ubuntu users.
    48 # deb http://archive.canonical.com/ubuntu precise partner
    49 # deb-src http://archive.canonical.com/ubuntu precise partner
    50
    51 ## This software is not part of Ubuntu, but is offered by third-party
    52 ## developers who want to ship their latest software.
    53 # deb http://extras.ubuntu.com/ubuntu precise main
    54 # deb http://security.ubuntu.com/ubuntu/ precise main
    55 # deb-src http://security.ubuntu.com/ubuntu/ precise main
    56 # deb-src http://extras.ubuntu.com/ubuntu precise main
madhu@madhu-desktop:~$

The package manager troubleshooting procedure shows that there apparently was some minor problem, and it was able to solve it. As far as I can see, the package management system now is in a consistent state.

Now try the terminal commands

sudo dpkg-reconfigure locales
locale

and copy/paste all output into this question document as done before.

madhu@madhu-desktop:~$ sudo dpkg-reconfigure locales
[sudo] password for madhu:
Generating locales...
  en_AG.UTF-8... up-to-date
  en_AU.UTF-8... up-to-date
  en_BW.UTF-8... up-to-date
  en_CA.UTF-8... up-to-date
  en_DK.UTF-8... up-to-date
  en_GB.UTF-8... up-to-date
  en_HK.UTF-8... up-to-date
  en_IE.UTF-8... up-to-date
  en_IN.UTF-8... up-to-date
  en_NG.UTF-8... up-to-date
  en_NZ.UTF-8... up-to-date
  en_PH.UTF-8... up-to-date
  en_SG.UTF-8... up-to-date
  en_US.UTF-8... up-to-date
  en_ZA.UTF-8... up-to-date
  en_ZM.UTF-8... up-to-date
  en_ZW.UTF-8... up-to-date
Generation complete.
madhu@madhu-desktop:~$ locale
LANG=en_IN
LANGUAGE=en_IN:en
LC_CTYPE="en_IN"
LC_NUMERIC="en_IN"
LC_TIME="en_IN"
LC_COLLATE="en_IN"
LC_MONETARY="en_IN"
LC_MESSAGES="en_IN"
LC_PAPER="en_IN"
LC_NAME="en_IN"
LC_ADDRESS="en_IN"
LC_TELEPHONE="en_IN"
LC_MEASUREMENT="en_IN"
LC_IDENTIFICATION="en_IN"
LC_ALL=
madhu@madhu-desktop:~$

It seems everything is OK. But still wish to know it from you. If OK, can I enable the other softwares now? Can I change the server?

> You might try using the system language settings dialogue

Don't know where I can find system language settings dialogue
Need I do anything in the System setup before booting?

This is the output ( without doing anything ):
madhu@madhu-desktop:~$ cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
madhu@madhu-desktop:~$

It depends on the Ubuntu version and the desktop environment in use, where to find the system settings dialogue.

By clicking in the "gear" icon in the top right corner of the screen you should see an entry "System settings".
Or just search for "system settings" in the dash (if you are using the desktop with the dash)
Or use the menu Applications - system Tools - ... (if you are using the desktop with the menu)

I am using 12.04 LTS. So I have Dash Home. When I clicked on Language Support, the following pop-up window appeared:
----------------------------------------------------------
The language support is not installed completely
Some translations or writing aids available for your chosen languages are not installed yet. Do you want to install them now?

DETAILS:

libreoffice-l10n-en-za
poppler-data
language-pack-kde-en
openoffice.org-hyphenation
hunspell-en-ca
hyphen-en-us
myspell-en-au
mythes-en-au
kde-l10n-engb
myspell-en-gb
libreoffice-l10n-en-gb
myspell-en-za
wbritish
libreoffice-help-en-gb
mythes-en-us
------------------------------------------------------
Since I couldn't find anything in 'in' (as India's) and to avoid further problems I didn't install anything. Need I install all these items?

Yes, I think you should install all these proposed packages. Even if they do not provide English as spoken/written in India, they make sure that British English is available as fallback for any items that are missing in English for India.

Did as you said. set back to English (India). Restarted. But no change in the output

madhu@madhu-desktop:~$ locale
LANG=en_IN
LANGUAGE=en_IN:en
LC_CTYPE="en_IN"
LC_NUMERIC="en_IN"
LC_TIME="en_IN"
LC_COLLATE="en_IN"
LC_MONETARY="en_IN"
LC_MESSAGES="en_IN"
LC_PAPER="en_IN"
LC_NAME="en_IN"
LC_ADDRESS="en_IN"
LC_TELEPHONE="en_IN"
LC_MEASUREMENT="en_IN"
LC_IDENTIFICATION="en_IN"
LC_ALL=
madhu@madhu-desktop:~$
--------------------------------------------
madhu@madhu-desktop:~$ cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
madhu@madhu-desktop:~$

A jerking only .... when I clicked on Apply System-Wide. No Authentication needed to change to this Regional language. So I am not sure whether it has been changed or not.

For testing, I tried to select another language from REGIONAL FORMATS...Clicked on APPLY SYSTEM-WIDE...Then I was asked to enter password to authenticate. But I didn't enter it to switch over to that one. Can I use any terminal command? Or Need I report this as a bug?

I have not seen any warning or error messages in your output any more. LANG and LANGUAGE are defined now. LC_ALL is not set on all system, so this can be ok on your system.

You have to be aware that whenever you provide your password for an admin action, this is temporarily store and you will not be asked again for the next ten minutes. Maybe this was the case also in the situation above.

So in the moment I do not see anything wrong.
Do you see more problems on your system? If yes, please provide details.

As you said I COULDN'T SEE ANYTHING WRONG this time after the change of Regional language. The following three lines in the Update Manager has disappeared when I updated today.

locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

I shall post if there is any problem in the next Updating.

Thanks a lot, Manfred Hampl for treating this chronic disease.

Thanks Manfred Hampl, that solved my question.