I confirm that this is still an issue in Trusty. However, in #1326412, Dimitri John Ledkov wrote
> This is fixed in utopic, and will not be fixed in trusty. > One will have to boot under upstart to dist-upgrade reliable within trusty.
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1326412
I confirm that this is still an issue in Trusty. However, in #1326412, Dimitri John Ledkov wrote
> This is fixed in utopic, and will not be fixed in trusty.
> One will have to boot under upstart to dist-upgrade reliable within trusty.
https:/ /bugs.launchpad .net/ubuntu/ +source/ ubuntu- release- upgrader/ +bug/1326412