I recently downloaded Lubuntu on my laptop, and I used a CD to install it.
My internet was not on.
After I got an internet connection, I tried using sudo apt-get install... to install various softwares such as libreoffice etc. but it just says package unavailable.
The Lubuntu Software Center doesn't have any of the softwares I need. They only have the very basic and the seemingly unnecessary.
It is slightly hard to do anything now, seeing as I can't download flash or java, or even update the version of the default Chrome installed.
How do I solve this problem?
EDIT:
Results of cat /etc/apt/sources.list
#deb cdrom:[Lubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130423.1)]/ raring main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://in.archive.ubuntu.com/ubuntu/ raring main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ raring main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://in.archive.ubuntu.com/ubuntu/ raring-updates main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ raring-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/ raring universe
deb-src http://in.archive.ubuntu.com/ubuntu/ raring universe
deb http://in.archive.ubuntu.com/ubuntu/ raring-updates universe
deb-src http://in.archive.ubuntu.com/ubuntu/ raring-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/ raring multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ raring multiverse
deb http://in.archive.ubuntu.com/ubuntu/ raring-updates multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ raring-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/ raring-backports main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ raring-backports mainrestricted universe multiverse
deb http://security.ubuntu.com/ubuntu raring-security main restricted
deb-src http://security.ubuntu.com/ubuntu raring-security main restricted
deb http://security.ubuntu.com/ubuntu raring-security universe
deb-src http://security.ubuntu.com/ubuntu raring-security universe
deb http://security.ubuntu.com/ubuntu raring-security multiverse
deb-src http://security.ubuntu.com/ubuntu raring-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 raring partner
# deb-src http://archive.canonical.com/ubuntu raring 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 raring main
deb-src http://extras.ubuntu.com/ubuntu raring main
EDIT :
I tried following the answer to this question, but I only eventually get, after all the updation,
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/source/Sources 404 Not Found
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
This is to show that this question is not duplicate.
