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I love Ubuntu. But I wish their package manager supported "undo".

You could use the Nix package manager with Ubuntu. Not ideal, but maybe it helps your use-case.

https://ariya.io/2020/05/nix-package-manager-on-ubuntu-or-de...

It does, if you use ZFS, for which there's an option during the install: https://www.maketecheasier.com/use-zfs-snapshots-ubuntu/

ZFS is currently broken in Ubuntu 21.10, as mentioned in the release notes. Don't install or upgrade to Ubuntu 21.10 if you're using ZFS, or you may experience filesystem corruption.

etckeeper helps, too, if you're not on a CoW filesystem

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