I was right. The code does print("Continue? [yN] ", end="") and then
sys.stdin.readline() with no flush in between.
Here's a suggested patch for trusty's update-release-upgrader. I
haven't tested it (since I already upgraded my 14.04 to 14.10). It also
needs to be forward-ported to later versions so this bug won't regress.
I think this kind of UI glitch merits a SRU.
** Patch added: "suggested patch"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1417880/+attachment/4311935/+files/fix-lp1417880.debdiff
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https://bugs.launchpad.net/bugs/1417880
Title:
Invisible prompts in do-release-upgrade
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