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I tried reinstalling gnome software but failed to do so.

Screen-shot of terminal:

image

please post a solution for this.

Videonauth
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Satish Raja
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  • My be tho following link can help: http://askubuntu.com/questions/78951/how-do-i-remove-a-malformed-line-from-my-sources-list – Apurba Jun 11 '16 at 06:51

1 Answers1

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Do the following in terminal after you became root by sudo su. You can copy and paste (ctrl+shift+v)the following block in one piece to your terminal and hit enter once to finish it and be back at your normal user:

mv /etc/apt/sources.list{,.repairbackup}
cat > /etc/apt/sources.list << EOF
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
#deb http://archive.ubuntu.com/ubuntu xenial-proposed main restricted universe multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
EOF
exit

This will whilst fixing your problem turn on all repositories and remove possible added repositories which have an entry in /etc/apt/sources.list this why this procedure saves your before existing sources.list file to sources.list.repairbackup so you can look at them and find the error. To add or remove repositories from this list please use the System Settings dialog for that.

Videonauth
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  • Maybe `gksudo gedit` will be easier for a new user? –  Jun 11 '16 at 07:06
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    May be but harder to explain the solution in detail, beside `gksudo` is not installed by default and would need to install another package which is at the current situation maybe not even possible due to the malformations in `sources.list`. This is why i proposed this solution. – Videonauth Jun 11 '16 at 07:08