[Bug 1721882] [ubuntu-release-upgrader/zesty] possible regression found

[Ubuntu Foundations Team Bug Bot]

As a part of the Stable Release Updates quality process a search for
Launchpad bug reports using the version of ubuntu-release-upgrader from
zesty-proposed was performed and bug 1727777 was found.  Please
investigate this bug report to ensure that a regression will not be
created by this SRU. In the event that this is not a regression remove
the "verification-failed" tag from this bug report and add the tag "bot-
stop-nagging" to bug 1727777 (not this bug). Thanks!

** Tags added: verification-failed

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1721882

Title:
  Generic instructions for dealing with full partitions don't help much

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Committed
Status in ubuntu-release-upgrader source package in Zesty:
  Fix Committed
Status in ubuntu-release-upgrader source package in Artful:
  Fix Released

Bug description:
  This a parallel to bug 1477455 regarding update-manager and a full
  /boot partition.

  [Impact]
  ubuntu-release-upgrader provides generic instructions if a system being upgrade is calculated to not have enough free space for the upgrade to succeed. The instructions include using apt clean and emptying trash. This message won't help if you have a separate boot partition that is low on free space though.

  [Test Case]
  1) Create a file to be used as a /boot partition (dd if=/dev/zero of=fake-boot bs=1024 count=204800)
  2) mkfs -t ext3 fake-boot
  3) copy your real /boot somewhere
  4) sudo mount -t ext3 fake-boot /boot
  5) copy the files from step 3 to /boot
  6) fill up /boot so there is less 30MB free space
  7) run 'do-release-upgrade -p' (-p is for proposed)

  With the current version of ubuntu-release-upgrader you'll see an
  error message with instructions to "empty your trash and remove
  temporary packages." With the version of ubuntu-release-upgrader in
  -proposed you'll receive a message regarding using "sudo apt
  autoremove".

  [Regression Potential]
  We are just changing the strings used in the error message, which will introduce untranslated strings but that is better than leaving people with systems that cannot update.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1721882/+subscriptions