Me too.
Turns out the problem for me is updating *while* copying a hard-drive
(in another terminal).
The "update-initramfs" script calls "sync" in the "generate_initramfs"
function. For me, copying hard-drives at the same time caused "sync" to
hang: Then the whole thing hangs.
I CTRL-Z'd (TSTP) my rsync process (doing the copying), and a few
seconds later update-initramfs un-hung. Finished without a problem.
Proposed workarounds:
1- stop/pause large disk i/o operations while updating, or
2- edit "/usr/sbin/update-initramfs": comment out the "sync" command in the
"generate_initramfs" function
This is why Ubuntu (and other Linux distros) needs a user-space "fsync"
command; so instead of trying to sync busy drives that could be busy for
days, it can just "fsync ${file}" and get on with the day.
Not sure if this will fix anyone else's problems, but it's all unicorns
and rainbows over here, now.
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https://bugs.launchpad.net/bugs/1667512
Title:
update-initramfs hangs on upgrade, dpkg unusable, unbootable system
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