[Bug 1854031] Re: reproducible shutdown on Xubuntu 19.10 live session

[Tarun]

encountered this while getting annoyed by
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1853986

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https://bugs.launchpad.net/bugs/1854031

Title:
  reproducible shutdown on Xubuntu 19.10 live session

Status in ubiquity package in Ubuntu:
  New

Bug description:
  use rufus to create a 10 GB persistence pen drive(San Disk Ultra Fit).

  then boot into it(don't press anything at selection menu), and open
  terminal.

  enter 'lspci' or 'sudo lspci' in terminal. wait a few minutes.

  screen goes black. then a few messages appear. then xubuntu shuts
  down.

  
  this was reproducible, so I tried it a few times to write down the messages. couldn't get a single entire message, so here's a few examples gathered that way.

  ```
  xorg[2551]: failed to idle channel 2 [Xorg[2551]]
  nouveau 0000:01:00.0: tmr: stalled at ffff
  ```

  ```
  xorg[2536]: failed to idle channel 2 [Xorg[2536]]
  nouveau 0000:01:00.0: tmr: stalled at ffff
  ```

  the system is 'MSI GL63 8RE 455IN', nothing exotic.

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