In UBUNTU one has to rely on source.lst for fetching various available updates and interns upgrade. Once modify source.lst file with while running as sudo.
source.lst can be found at "/etc/apt/sources.list"
---------------Content of source.lst ----------------------------------------------------------------
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise universe
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse
-------------------------------------------------------------------------------------------------------------------
If one has to fetch update from particular website which offer packages for UBUNTU that can be added in this source.lst file and the one can execute below commands:
sudo apt-get update
sudo apt-get upgrade
To proceed further suppose you have CD-ROM with which you believe can upgrade your system. your add that CD-ROM in source.lst. To perform this
one has to look into "apt-cdrom" command:
vikram@vikram-Veriton-Series:~$ apt-cdrom
apt 0.8.16~exp12ubuntu10.16 for i386 compiled on Nov 15 2013 15:33:51
Usage: apt-cdrom [options] command
apt-cdrom is a tool to add CDROM's to APT's source list. The
CDROM mount point and device information is taken from apt.conf
and /etc/fstab.
Commands:
add - Add a CDROM
ident - Report the identity of a CDROM
Options:
-h This help text
-d CD-ROM mount point
-r Rename a recognized CD-ROM
-m No mounting
-f Fast mode, don't check package files
-a Thorough scan mode
--auto-detect Auto detect drive and mount point
-c=? Read this configuration file
-o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
See fstab(5)
source.lst can be found at "/etc/apt/sources.list"
---------------Content of source.lst ----------------------------------------------------------------
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise universe
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse
-------------------------------------------------------------------------------------------------------------------
If one has to fetch update from particular website which offer packages for UBUNTU that can be added in this source.lst file and the one can execute below commands:
sudo apt-get update
sudo apt-get upgrade
To proceed further suppose you have CD-ROM with which you believe can upgrade your system. your add that CD-ROM in source.lst. To perform this
one has to look into "apt-cdrom" command:
vikram@vikram-Veriton-Series:~$ apt-cdrom
apt 0.8.16~exp12ubuntu10.16 for i386 compiled on Nov 15 2013 15:33:51
Usage: apt-cdrom [options] command
apt-cdrom is a tool to add CDROM's to APT's source list. The
CDROM mount point and device information is taken from apt.conf
and /etc/fstab.
Commands:
add - Add a CDROM
ident - Report the identity of a CDROM
Options:
-h This help text
-d CD-ROM mount point
-r Rename a recognized CD-ROM
-m No mounting
-f Fast mode, don't check package files
-a Thorough scan mode
--auto-detect Auto detect drive and mount point
-c=? Read this configuration file
-o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
See fstab(5)
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