Public bug reported:
14.04 -> 14.10 went flawlessly, on my nearly-default-install laptop.
The only problem I noticed was when prompted to yN or d for details.
After hitting d, return, then exitting from less (without doing anything
weird like ^z), the prompt for what to do next wasn't printed. I think
somehow the process printing it started line buffering instead of doing
unbuffered i/o, because when I did press y, I saw multiple prompts all
on the same line. (I think. They linewrapped, and scrolled away
quickly. I should have hit ^space [ to enter screen's copy/paste mode,
where scrolling is prevented (tty output blocks once the buffer fills
up. I love that do-release-upgrade automatically run itself in a screen
session.)
I reproduced it on my desktop (still running 14.04 for now), too. I
only had to go as far as having 'do-release-upgrade -d' comment-out all
my PPAs in sources.list (which it puts back when you say N to cancel),
and download some lists, before the first yN/ [d]etails prompt.
tty echo is still enabled. The less status-line prompt disappears,
leaving the last line of the screen empty until you type anything.
The laptop (amd64) ran sudo do-release-upgrade -d from a gnome-terminal
tab, running under a stock Ubuntu Gnome desktop.
The desktop (amd64) ran sudo do-release-upgrade -d from a screen session
in a gnome-terminal tab, in a fluxbox session.
LANG=en_CA.UTF-8 on the laptop, en_CA.utf8 on the desktop.
copy-pasted from my gnome-terminal after reproducing the bug and
pressing return a few times before N<return>:
...
libunwind-dev libva-drm1 libvisio-0.1-1 libvlccore8 libvncclient0
libwireshark5 libwiretap4 libwpd-0.10-10 libwpg-0.3-3 libwps-0.3-3
libwsutil4 libx32asan1 libx32cilkrts5 libx32gcc-4.9-dev
libx32stdc++-4.9-dev libx32ubsan0 libxcb-xkb1 libxkbcommon-x11-0
N
Continue [yN] Details [d]Continue [yN] Details [d]Continue [yN] Details
[d]Continue [yN] Details [d]Continue [yN] Details [d]Continue [yN] Details
[d]Continue [yN] Details [d]
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done
=== Command terminated with exit status 1 (Wed Feb 4 03:28:41 2015) ===
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1417904
Title:
terminal settings messed up after do-release-upgrade run less for you
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