In /etc/gdm3/custom.conf, on [debug] section, I activated Enable=true, here is the complete startup log.
But following command didn't work in chroot (to get more infos from gdm) : root@ubuntu:/# sudo journalctl -b -u gdm No journal files were found. -- No entries -- ** Attachment added: "Syslog3" https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1723577/+attachment/4973896/+files/Syslog3 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1723577 Title: Artful won't start with Wayland activated (AMD?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1723577/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp