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Repository update-Unable to

Posted: Fri Jan 07, 2022 8:26 pm
by tosim
While updating Linux Mint,20.2, received following message:
The repository ' ... /linuxmint uma Release' does not have a Release file.Updating from such a repository can't be done securely, and is therefore disabled by default.See apt-secure(8) manpage for repository creation and user configuration details.

BTW: Am using MMex,1.53, from a "deb download.