I can boot into a terminal from Grub using recovery mode.
syslog shows the system running the following loop:
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systemd[1]: Starting Light Display Manager
lightdm[2822]: Could not enumerate user data directory /var/lib/lightdm-data/lightdm: Error opening directory '/var/lib/lightdm-data/lightdm': No such file or directory
systemd[1]: Started Light Display Manager
systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: lightdm.service: Failed with result 'exit-code'.
systemd[1]: lightdm.service: Service RestartSec=100ms expired, scheduling restart
systemd[1]: lightdm.service: Scheduled restart job, restart counter is at <>.
systemd[1]: Stopped Light Display Manager
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DEBUG: XServer 0: Connecting to XServer :0
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[ 420,876](EE) modeset(0): [DRI2] No driver mapping found for PCI device 0x8086 / 0x0be1
[ 42.877] (EE) modeset(0): Failed to initialize the DRI2 extension
I have tried lxdm instead of lightdm and I get the same problem and similar outputs.
What should I do next to diagnose the problem?