Dear Andy,
While Michael Biebl is right and perhaps those dmesg logs might give
an answer to what actually happened, the criticalness you gave to the
bug had me using a work-around which didn't crash the system.
1. Do CTRL+ALT+F1...F6 (anyone)
2. Login as a normal user
3. Do sudo /etc/init.d/gdm3 stop
4. Do sudo aptitude install network-manager network-manager-gnome
libnm0 libnma0 libnm-glib-vpn1 libnm-glib4 libnm-gtk0
5. Let it install smoothly
6. sudo /etc/init.d/gdm3 start/restart
7. Login as a normal user and start using debian with the new/shiny
network-manager.
This is just a work-around and doesn't deal with the problem at all.
This is for all those if they get into the same issue as you. You do
not have to remove network-manager as OP has done or even reboot
multiple times as OP has tried and failed.
Another thing is share the log from /var/log/dmesg as Michael shares
above, the more info. he has the better he would be at better
debugging why it crashed. It has been years since a single application
has crashed a whole Debian session to my mind.
Hope the above helps.
--
Regards,
Shirish Agarwal शिरीष अग्रवाल
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