This bug was fixed in the package casper - 1.393

casper (1.393) bionic; urgency=medium

  * Cache Ubuntu fonts for plymouth on shutdown. LP: #1760598

 -- Dimitri John Ledkov <>  Wed, 04 Apr 2018 11:55:32

** Changed in: casper (Ubuntu)
       Status: Fix Committed => Fix Released

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  I/O Error after clicking "reboot now" - Ubuntu font missing from
  casper shutdown

Status in ubuntu-mate:
Status in casper package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
Status in ubiquity package in Ubuntu:
Status in ubuntu-mate-welcome package in Ubuntu:

Bug description:
  ubuntu Plymouth theme now correctly uses Ubuntu font, meaning it needs
  to be cached for display of the shutdown message.

  We really should be using shutdown initramfs on the livecd....


  Tested in Virtualbox VM.
  Ubuntu MATE works after force-reboot, but after I click on "restart now" 
after completing the installation, the screen shows me this:

  req_error: I/O error, dev sr0, sector 1488792

  And the above message loops a couple times, and wont turn off the
  computer to restart.

  No error happens after force reboot, and the OS boots properly, but
  I'm curious as to what's causing this.

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