This message comes from Python's built-in 'marshal' module, and it
happens when EOF occurs unexpectedly while unmarshalling a string
object. Marshal is the technology that underlies .pyc files, so this is
only going to happen if you have corrupt .pyc files.
I have no idea what could be causing your .pyc files to be corrupted,
but it's unlikely to be a problem in Python or do-release-upgrade.
Perhaps you have a bad disk or some other hardware problem, or perhaps
you're running on a weird or corrupted file system. E.g. problems with
an encrypted disk or RAID could cause this. It's possible that a full
file system at the time of package installation or upgrade could also
cause such problems.
There's probably nothing we can do about it except to recommend that you
re-install the affected packages. This will cause Python to re-byte
compile the py files into new pyc files, hopefully fixing the
corruption.
I'm going to mark this as Incomplete, but if you find a way to reliably
reproduce this, and can discount hardware or filesystem problems, feel
free to re-open it. If you can identify a corrupt .pyc file, please
attach it - it would be interesting to pick that apart.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1058884
Title:
do-release-upgrade crashed with EOFError in /usr/lib/ubuntu-release-
upgrader/check-new-release: EOF read where not expected
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