unable to install any software from ubuntu software centre

What is the output of:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

Thanks

the output is like this:

ruhul@ruhul-Vostro-3546:~$ sudo apt-get update
[sudo] password for ruhul:
Err http://dl.google.com stable Release.gpg
  Could not connect to dl.google.com:80 (74.125.200.91). - connect (111: Connection refused) [IP: 74.125.200.91 80]
Err http://dell.archive.canonical.com precise-dell Release.gpg
  Could not connect to dell.archive.canonical.com:80 (91.189.90.29). - connect (111: Connection refused)
Err http://oem.archive.canonical.com precise-oem-sp1 Release.gpg
  Could not connect to oem.archive.canonical.com:80 (91.189.90.29). - connect (111: Connection refused)
Err http://in.archive.ubuntu.com precise Release.gpg
  Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) [IP: 91.189.88.162 80]
Reading package lists... Done
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) [IP: 91.189.88.162 80]

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg Could not connect to dl.google.com:80 (74.125.200.91). - connect (111: Connection refused) [IP: 74.125.200.91 80]

W: Failed to fetch http://dell.archive.canonical.com/updates/dists/precise-dell/Release.gpg Could not connect to dell.archive.canonical.com:80 (91.189.90.29). - connect (111: Connection refused)

W: Failed to fetch http://oem.archive.canonical.com/updates/dists/precise-oem-sp1/Release.gpg Could not connect to oem.archive.canonical.com:80 (91.189.90.29). - connect (111: Connection refused)

W: Some index files failed to download. They have been ignored, or old ones used instead.
ruhul@ruhul-Vostro-3546:~$

Are you on a corporate network or do you use a proxy for Web access?

What is the output of:

cat /etc/apt/apt.conf

(if anything)

Thanks

it shows

ruhul@ruhul-Vostro-3546:~$ cat/etc/apt/apt.conf
bash: cat/etc/apt/apt.conf: No such file or directory

should i install a newer version of ubuntu ?

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.

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

Please post the full Terminal output from step 6 here:

https://answers.launchpad.net/ubuntu/+source/software-center/+question/314482

Thank u all for answering my question. The problem has been solved after upgrading the system to ubuntu 16.04 LTS.