I installed nvidia drivers (driver 460). For that I did the installation via tty as nvidia want. To do that, I did
systemctl disable lightdm.service
systemctl stop lightdm.service
Now I have the nvidia driver installed (I can see that with nvidia-smi). But I can't rerun lightdm.
I tried differents methods:
systemctl enable lightdm.service dpkg-reconfigure lightdm apt install --reinstall lightdm update-alternative --config display-manager.service systemctl restart lightdm systemctl enable lightdm.service
With this last command, The screen switch from tty to black screen (it's the same if I reboot without doing anything)
and when I do
systemctl enable lightdm.service
I have the following message:
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias settings in the [Install] section, and DefaultInstance for template units). This means they are not meant to be enabled using systemctl. Possible reasons for having this kind of units are: 1) A unit may be statically enabled by being symlinked from another unit's .wants/ or .requires/ directory. 2) A unit's purpose may be to act as a helper for some other unit which has a requirement dependency on it. 3) A unit may be started when needed via activation (socket, path, timer, D-Bus, udev, scripted systemctl call, ...). 4) In case of template units, the unit is meant to be enabled with some instance name specified.
I haven't other idea to solve my problem now