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Every time I try to update or install a package or open software center, I get an error something like 

E: The repository 'http://ppa.launchpad.net/tista/adapta/ubuntu disco Release' does not have a Release file.

I am on latest Ubuntu 19.04.

Kulfy
  • 18,154
maxe moas
  • 11

1 Answers1

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There is no PPA for the disco version.

In terminal...

cd /etc/apt # change directory

grep -i tista sources.list # search in sources.list

grep -i tista sources.list.d/*.list # search in individual .list files

Once "tista" is found ,edit that file, and change disco to cosmic.

sudo -H gedit /path_to_found_filename/found_filename # edit the found file

heynnema
  • 73,649