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I did sudo apt update and sudo apt upgrade and it stated something along the lines of the upgrade was not completely successful and asked if I wanted to do a partial upgrade or continue. I did the partial upgrade and it changed my OS to Pop! OS. How do I go back to what I previously had i.e. Ubuntu 20.04? I restored a backup but the OS is still the same.

mikanim
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    If you add Pop OS repositories to a Ubuntu system, but don't pin the upgrades to the specific packages you wanted, you risk your system becoming a Pop OS one. System 76 provided warnings of that if you look (tweets & on their web site) Upgrade tools go to later packages automatically; restoring data from backups is the normal way back, as package tools are one-way; but you could try ppa-purge – guiverc Feb 11 '22 at 02:20

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