I just had the same problem: I wanted to inspect a merge conflict in conffiles,
went into a shell and started joe, pressed Ctrl-C to exit joe without changes,
just to see the session disappear.
Taskmanager confirmed that joe was still running in the background.
Workarounds:
FAILED: screen wouldn't work because I did not have it installed, and I
couldn't do apt-get because the package repository was locked.
FAILED: I was told by a program (apt-get probably but I'm not sure) told me
that a reboot might help.
Fortunately, that didn't work either: the reboot command said something about
unfinished business (the message sounded like systemd terminology but I can't
say for sure, and I don't want to retry with a half-upgraded system: the reboot
might work, and I don't want that anymore).
WORKED: I found, downloaded and compiled reptyr ("re-pty-er").
Running "reptyr -T <pid of the editor process>" reconnected me. I haven't
closed the editor yet (I'll just kill it if I find I can't close it without
pressing Ctrl-C).
This worked because I happened to have git, gcc and related buildtools
installed; I'm extremely lucky because I had considered uninstalling gcc
because it's been more than a year since I last touched it; I don't know how to
install a C compiler without a package manager (now *that* would have been
fun...)
CONCLUSION:
I find it pretty harsh to put people in an environment where a single keypress
can put them so deeply into such a tricky-to-escape-from situation.
I'm still pretty anxious because I don't know whether I can return to the
entire process when I close the editor - the -T option hopefully has taken care
of that, but reptyr is doing pretty bizarre and arcane stuff, which means that
its failure modes will be even more bizarre and arcane. Hopefully I won't
encounter any of these failure modes, but it's a scary situation to be in!
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https://bugs.launchpad.net/bugs/1343737
Title:
^x ^c while running an editor inside do-release-upgrade's screen
session disconnects part of the session
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