OK, we're going to need to analyse the hung gnome-shell process. Please
try to do this:

1. Install openssh-server:
   sudo apt install openssh-server
2. Using a second machine, log into the offending machine via SSH:
   ssh <USERNAME>@<HOSTNAME> 
   where <USERNAME> is your username, and <HOSTNAME> is either hostname or the 
machine's IP address.
3. Reproduce the hang.
4. From your ssh login, run:
   killall -TRAP -u $USER gnome-shell
5. Look in /var/crash for a newly created file, something like 
'_usr_bin_gnome-shell.1000.crash'
6. Upload the crash file using this command or similar:
   ubuntu-bug /var/crash/_usr_bin_gnome-shell.1000.crash
7. Tell use the new bug ID that was created.


** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1697450

Title:
  Gnome Shell hangs at startup

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