On 17/10/2018 21:15, Jean-Luc CECCOLI wrote:


DT displays correctly now, but I needed to clean the software center first : I 
discovered that all PPAs still were xenial ones, and I really can't figure out 
why.
I suppressed them and now am on the way to reinstall the correct ones.
I will ber very carefull before I upgrade my main computer from 16.04 to 18.04.

This is expected --- PPAs are disabled on upgrade, and not re-enabled after --- because they can or cannot exists for the new version, you have to do it by hand. The package installed _from the PPAs_, on the other hand, are not removed --- they simply linger on.

The correct way of upgrading would be to manually _purge_ (remove and uninstall all the packages installed from them) all the PPAs and then reinstall them, so that the upgrade is taking a known "standard" status as base. In the past, very bad things happened if you didn't do that; nowadays Ubuntu is more robust and, for example, for me the transition 16.04  -> 18.04 has been the smoothest ever.

Romano



--
Romano Giannetti
http://www.rgtti.com/

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