Thank you for your quick reply ... update manager is working now ... but it did not update anything .
I checked my version in terminal
root@tarun-G41MT-S2P:~# lsb_release -a
LSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3.2-noarch:core-4.0-ia32:core-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise
Thank you for your quick reply ... update manager is working now ... but it did not update anything . G41MT-S2P: ~# lsb_release -a 0-ia32: core-2. 0-noarch: core-3. 0-ia32: core-3. 0-noarch: core-3. 1-ia32: core-3. 1-noarch: core-3. 2-ia32: core-3. 2-noarch: core-4. 0-ia32: core-4. 0-noarch
I checked my version in terminal
root@tarun-
LSB Version: core-2.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise
Is this the lastest version of 12.04?