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There is a red exclamation sign in the notification area.
When I run sudo apt-get update the state of terminal is below:

Ign http: //bd.archive.ubuntu.com trusty/universe  Translation-en_US
Fetched 3,826 kB in 54s (70.5 kB/s)
N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension<br>
W: GPG error: http: //download.opensuse.org ./ Release: The following signatures were invalid: KEYEXPIRED 1436387333
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/source/Sources  404  Not Found
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch http: //ppa.launchpad.net/disper-dev/ppa/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found   
E: Some index files failed to download. They have been ignored, or old ones used instead.

How should I proceed?

A.B.
  • 90,397
MRZ Khan
  • 1

1 Answers1

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The PPA doesn't provides packages for Trusty and newer. Check this link.

Therefore

  • remove

    Without a downgrade of the installed packages from this PPA

    sudo rm /etc/apt/sources.list.d/disper-dev-ubuntu-ppa*

or

  • purge

    Downgrades all packages from this PPA, if possible

    sudo apt-get install ppa-purge
sudo ppa-purge ppa:disper-dev/ppa

After that

sudo apt-get update
A.B.
  • 90,397