Public bug reported:

[Impact]
The cdrom media change prompt hangs on EOF. This causes the autopkgtest to hang 
when run in a debian lxd container for unknown reasons related to lxd/systemd 
isolation likely (it works fine in Ubuntu), but it's also surprising behavior 
in general.

[Test plan]
We did not really come up with a test for this except running autopkgtest -- 
lxd autopkgtest/debian/$suite/$arch. That being said, the change is minimal, 
and we do test the positive case in the test suite.

[Where problems could occur]
This change is isolated to the handling of pressing 'c' or hitting EOF inside 
the media change prompt, so any regressions would occur solely within that 
space. We do not foresee any regressions from the change as intended, as it 
seems unlikely that "hanging" is what you actually want.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1928687

Title:
  Avoid infinite loop on EOF on media change prompt

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