Cannot obtain lock error on Discover

I am using plasma-discover and discover is opening. I am trying to install gimp or inkscape and it asks me password. When I put it correctly it shows task(100%) and stops popping up “cannot obtain lock”.

‘uname -a’ command returns Linux lubuntu 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

The image I installed is downloaded from

Please help me out.

Does it happen all the time? Perhaps the update application is running and does not allow you to do both, Try launching the application from the console to see if it gives more information

The error message is normal, if you have two running processes which are dealing with packages.

What you can do:

  1. Close all your open Discover/Muon/Synaptic instances.
  2. Wait 15 minutes. Maybe there is an autoupdate running in the background.

If the problem still persists, than we have to find out, which process is blocking you.

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