I've always just clean-installed then copied the containers/vms using vzdump and pct restore/qmrestore I learned stuff like this years ago with upgrades to deb

I've always just clean-installed then copied the containers/vms using vzdump and pct restore/qmrestore I learned stuff like this years ago with upgrades to debian/ubuntu/etc - upgrading a distribution is a mess, and I've learned not to trust it.