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.
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5There aren't multiple error messages but only one error message. This would help you [What can I do if a repository/PPA does not have a Release file?](https://askubuntu.com/questions/866901/what-can-i-do-if-a-repository-ppa-does-not-have-a-release-file) – Kulfy Jun 11 '19 at 15:56
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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
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@maxemoas Please remember to accept my answer if it was helpful. Thanks! – heynnema Jun 11 '19 at 16:59