- How is the situation of Ubuntu 18.04?
I'm running Lubuntu 18.04.1 LTS and it works well for me. I have a test system of standard Ubuntu 18.04.1 LTS too, and I think it works well.
'Don't fix it if it ain't broke.'
My general recommendation is to stay with a working version as long as it is supported or at least until the next first point release of the next LTS version (16.04.1 LTS, 18.04.1 LTS, 20.04.1 LTS). Switch to a new version before the old version passes end of life (LTS: 5 years for standard Ubuntu and 3 years for the community flavours.)
- Have you been able to meet the need for gksu?
Yes, there are alternatives to gksu
. See this link.
In Xorg it is enough with
sudo -H gui-program
In Wayland you also need
xhost +si:localuser:root
to allow it to work.
- Is the software compatible with a new administrative method?
I don't understand what you mean.
- Otherwise, do you still have some way to reinstall it in the system?
Reinstalling Ubuntu is done as in previous versions. Or do you mean gksu
? Don't try to use it in 18.04 LTS.