i can not install adobe flash player

What is the output of:

sudo apt-get update; lsb_release -a; uname -a

Thanks

hi
No LSB modules are available.

system hanging, i can not even open ubuntu software centre

Can you post the full output please. There are no limits here

Fetched 2,847 kB in 33s (85.1 kB/s)
Reading package lists... Done
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
Linux maxwell 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Ign http://dl.google.com stable InRelease
Ign http://security.ubuntu.com precise-security InRelease
Ign http://in.archive.ubuntu.com precise InRelease
Hit http://dl.google.com stable Release.gpg
Ign http://extras.ubuntu.com precise InRelease
Hit http://dl.google.com stable Release
Ign http://in.archive.ubuntu.com precise-updates InRelease
Get:1 http://extras.ubuntu.com precise Release.gpg [72 B]
Hit http://dl.google.com stable/main amd64 Packages
Get:2 http://security.ubuntu.com precise-security Release.gpg [198 B]
Hit http://dl.google.com stable/main i386 Packages
Hit http://extras.ubuntu.com precise Release
Ign http://in.archive.ubuntu.com precise-backports InRelease
Ign http://dl.google.com stable/main TranslationIndex
Get:3 http://security.ubuntu.com precise-security Release [49.6 kB]
Hit http://in.archive.ubuntu.com precise Release.gpg
Hit http://extras.ubuntu.com precise/main Sources
Get:4 http://in.archive.ubuntu.com precise-updates Release.gpg [198 B]
Hit http://extras.ubuntu.com precise/main amd64 Packages
Hit http://in.archive.ubuntu.com precise-backports Release.gpg
Hit http://extras.ubuntu.com precise/main i386 Packages
Get:5 http://security.ubuntu.com precise-security/main Sources [64.0 kB]
Hit http://in.archive.ubuntu.com precise Release
Ign http://extras.ubuntu.com precise/main TranslationIndex
Get:6 http://in.archive.ubuntu.com precise-updates Release [49.6 kB]
Hit http://in.archive.ubuntu.com precise-backports Release
Ign http://dl.google.com stable/main Translation-en_IN
Get:7 http://security.ubuntu.com precise-security/restricted Sources [1,950 B]
Ign http://dl.google.com stable/main Translation-en
Hit http://in.archive.ubuntu.com precise/main Sources
Get:8 http://security.ubuntu.com precise-security/universe Sources [22.2 kB]
Hit http://in.archive.ubuntu.com precise/restricted Sources
Hit http://in.archive.ubuntu.com precise/universe Sources
Get:9 http://security.ubuntu.com precise-security/multiverse Sources [1,388 B]
Hit http://in.archive.ubuntu.com precise/multiverse Sources
Hit http://in.archive.ubuntu.com precise/main amd64 Packages
Get:10 http://security.ubuntu.com precise-security/main amd64 Packages [229 kB]
Ign http://extras.ubuntu.com precise/main Translation-en_IN
Hit http://in.archive.ubuntu.com precise/restricted amd64 Packages
Ign http://extras.ubuntu.com precise/main Translation-en
Hit http://in.archive.ubuntu.com precise/universe amd64 Packages
Hit http://in.archive.ubuntu.com precise/multiverse amd64 Packages
Hit http://in.archive.ubuntu.com precise/main i386 Packages
Hit http://in.archive.ubuntu.com precise/restricted i386 Packages
Get:11 http://security.ubuntu.com precise-security/restricted amd64 Packages [3,969 B]
Hit http://in.archive.ubuntu.com precise/universe i386 Packages
Get:12 http://security.ubuntu.com precise-security/universe amd64 Packages [68.2 kB]
Hit http://in.archive.ubuntu.com precise/multiverse i386 Packages
Hit http://in.archive.ubuntu.com precise/main TranslationIndex
Hit http://in.archive.ubuntu.com precise/multiverse TranslationIndex
Get:13 http://security.ubuntu.com precise-security/multiverse amd64 Packages [2,188 B]
Hit http://in.archive.ubuntu.com precise/restricted TranslationIndex
Hit http://in.archive.ubuntu.com precise/universe TranslationIndex
Get:14 http://security.ubuntu.com precise-security/main i386 Packages [239 kB]
Get:15 http://in.archive.ubuntu.com precise-updates/main Sources [368 kB]
Get:16 http://security.ubuntu.com precise-security/restricted i386 Packages [3,968 B]
Get:17 http://in.archive.ubuntu.com precise-updates/restricted Sources [5,135 B]
Get:18 http://in.archive.ubuntu.com precise-updates/universe Sources [79.3 kB]
Get:19 http://security.ubuntu.com precise-security/universe i386 Packages [69.9 kB]
Get:20 http://in.archive.ubuntu.com precise-updates/multiverse Sources [4,729 B]
Get:21 http://security.ubuntu.com precise-security/multiverse i386 Packages [2,362 B]
Get:22 http://in.archive.ubuntu.com precise-updates/main amd64 Packages [584 kB]
Hit http://security.ubuntu.com precise-security/main TranslationIndex
Hit http://security.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://security.ubuntu.com precise-security/restricted TranslationIndex
Hit http://security.ubuntu.com precise-security/universe TranslationIndex
Get:23 http://in.archive.ubuntu.com precise-updates/restricted amd64 Packages [9,565 B]
Hit http://security.ubuntu.com precise-security/main Translation-en
Get:24 http://in.archive.ubuntu.com precise-updates/universe amd64 Packages [181 kB]
Hit http://security.ubuntu.com precise-security/multiverse Translation-en
Hit http://security.ubuntu.com precise-security/restricted Translation-en
Get:25 http://in.archive.ubuntu.com precise-updates/multiverse amd64 Packages [9,436 B]
Hit http://security.ubuntu.com precise-security/universe Translation-en
Get:26 http://in.archive.ubuntu.com precise-updates/main i386 Packages [594 kB]
Get:27 http://in.archive.ubuntu.com precise-updates/restricted i386 Packages [9,503 B]
Get:28 http://in.archive.ubuntu.com precise-updates/universe i386 Packages [184 kB]
Get:29 http://in.archive.ubuntu.com precise-updates/multiverse i386 Packages [10.4 kB]
Hit http://in.archive.ubuntu.com precise-updates/main TranslationIndex
Hit http://in.archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://in.archive.ubuntu.com precise-updates/restricted TranslationIndex
Hit http://in.archive.ubuntu.com precise-updates/universe TranslationIndex
Hit http://in.archive.ubuntu.com precise-backports/main Sources
Hit http://in.archive.ubuntu.com precise-backports/restricted Sources
Hit http://in.archive.ubuntu.com precise-backports/universe Sources
Hit http://in.archive.ubuntu.com precise-backports/multiverse Sources
Hit http://in.archive.ubuntu.com precise-backports/main amd64 Packages
Hit http://in.archive.ubuntu.com precise-backports/restricted amd64 Packages
Hit http://in.archive.ubuntu.com precise-backports/universe amd64 Packages
Hit http://in.archive.ubuntu.com precise-backports/multiverse amd64 Packages
Hit http://in.archive.ubuntu.com precise-backports/main i386 Packages
Hit http://in.archive.ubuntu.com precise-backports/restricted i386 Packages
Hit http://in.archive.ubuntu.com precise-backports/universe i386 Packages
Hit http://in.archive.ubuntu.com precise-backports/multiverse i386 Packages
Hit http://in.archive.ubuntu.com precise-backports/main TranslationIndex
Hit http://in.archive.ubuntu.com precise-backports/multiverse TranslationIndex
Hit http://in.archive.ubuntu.com precise-backports/restricted TranslationIndex
Hit http://in.archive.ubuntu.com precise-backports/universe TranslationIndex
Hit http://in.archive.ubuntu.com precise/main Translation-en
Hit http://in.archive.ubuntu.com precise/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise/restricted Translation-en
Hit http://in.archive.ubuntu.com precise/universe Translation-en
Hit http://in.archive.ubuntu.com precise-updates/main Translation-en
Hit http://in.archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://in.archive.ubuntu.com precise-updates/universe Translation-en
Hit http://in.archive.ubuntu.com precise-backports/main Translation-en
Hit http://in.archive.ubuntu.com precise-backports/multiverse Translation-en
Hit http://in.archive.ubuntu.com precise-backports/restricted Translation-en
Hit http://in.archive.ubuntu.com precise-backports/universe Translation-en
Fetched 2,847 kB in 33s (85.1 kB/s)
Reading package lists... Done
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
Linux maxwell 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

If you run:

sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get install ubuntu-restricted-extras

It will not only install flash but some useful media codecs. If you install Chrome and browse with that it will come with its own flash and you don't need Adobe's offering

so i will do that command in terminal and let me see
thanks

If the previous commands from post #7 are not working, please send us the full Terminal output from step 5 and step 9 in the following procedure:

https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure