Same app appears twice in Software Center

No other sympotms seen so far.

What is the output of:

lsb_release -a; uname -a

Thanks

madhu@madhu-desktop:~$ lsb_release -a; uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
Linux madhu-desktop 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:31:23 UTC 2014 i686 i686 i686 GNU/Linux
madhu@madhu-desktop:~$

I don't know whether it appeared after increasing swap area.

See https://answers.launchpad.net/ubuntu/+question/256227

wget https://dl.dropbox.com/u/8850924/fixpackage
chmod +x ./fixpackage
sudo ./fixpackage

After running wget I tried the two commands

madhu@madhu-desktop:~$ chmod +x ./fixpackage
chmod: cannot access ‘./fixpackage’: No such file or directory
madhu@madhu-desktop:~$ sudo ./fixpackage
[sudo] password for madhu:
sudo: ./fixpackage: command not found
madhu@madhu-desktop:~$

Did you run the wget command I gave? That pulls down the script....

Yes, I did

Here are some lines ............. ( I have reported a bug on gnome calculator)

Preparing to unpack .../gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb ...
Unpacking gnome-calculator (1:3.10.2-0ubuntu1.2) over (1:3.10.2-0ubuntu1.1) ...
dpkg: error processing archive /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb (--unpack):
 symbolic link '/usr/share/help/ca/gnome-calculator/conv-character.page' size has changed from 62 to 5
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for mime-support (3.54ubuntu1) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for libglib2.0-0:i386 (2.40.2-0ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
madhu@madhu-desktop:~$ chmod +x ./fixpackage
chmod: cannot access ‘./fixpackage’: No such file or directory
madhu@madhu-desktop:~$ sudo ./fixpackage
sudo: ./fixpackage: command not found
madhu@madhu-desktop:~$

Please read # 9 also

I did use the command

#!/bin/bash
sudo cp -arf /var/lib/dpkg /var/lib/dpkg.backup
sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status
sudo cp /var/lib/dpkg/available-old /var/lib/dpkg/available
sudo rm -rf /var/lib/dpkg/updates/*
sudo rm -rf /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists/partial
sudo apt-get clean
sudo apt-get update
sudo dpkg --clear-avail
sudo dpkg --configure -a
sudo apt-get install -f
sudo apt-get update
sudo apt-get dist-upgrade

What is the output of:

df -h; lsb_release -a; df -i

Thanks

madhu@madhu-desktop:~$ df -h; lsb_release -a; df -i
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 583G 103G 451G 19% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 994M 4.0K 994M 1% /dev
tmpfs 201M 1004K 200M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1003M 84K 1003M 1% /run/shm
none 100M 36K 100M 1% /run/user
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sda1 38821888 483887 38338001 2% /
none 220111 2 220109 1% /sys/fs/cgroup
udev 215282 479 214803 1% /dev
tmpfs 220111 458 219653 1% /run
none 220111 1 220110 1% /run/lock
none 220111 6 220105 1% /run/shm
none 220111 24 220087 1% /run/user
madhu@madhu-desktop:~$

sudo dpkg --force-all -i /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb

Will get that installed for you

madhu@madhu-desktop:~$ sudo dpkg --force-all -i /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb
[sudo] password for madhu:
(Reading database ... 385405 files and directories currently installed.)
Preparing to unpack .../gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb ...
Unpacking gnome-calculator (1:3.10.2-0ubuntu1.2) over (1:3.10.2-0ubuntu1.1) ...
dpkg: error processing archive /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb (--install):
 symbolic link '/usr/share/help/ca/gnome-calculator/conv-character.page' size has changed from 62 to 5
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for mime-support (3.54ubuntu1) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for libglib2.0-0:i386 (2.40.2-0ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-calculator_1%3a3.10.2-0ubuntu1.2_i386.deb
madhu@madhu-desktop:~$
-----------------------------------------------------------------------------------------------

I tried this three times. But no change.

I notice you have a bug open for the gcalculator. I suspect that when the bug is resolved, the issue will subside.

Though this problem is not solved, I got good advice from you.
I shall wait for that. Thanks Actionparsnip.

No updating problem with gcalculator now, But no improvement. So, I have closed this question.