Your system does not have the latest version of snapd. Please update
the version of snapd on your system to improve the upgrade
experience.
Do you still want to continue with the upgrade?
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Mon Aug 6 11:13:04 2018) ===bdmurray@clean-xenial-amd64:~/u-r-u$ head -n20 /var/log/dist-upgrade/main.log
2018-08-06 11:07:09,619 INFO Using config files '['./DistUpgrade.cfg.xenial']'
2018-08-06 11:07:09,619 INFO uname information: 'Linux clean-xenial-amd64 4.4.0-121-generic #145-Ubuntu SMP Fri Apr 13 13:47:23 UTC 2018 x86_64'
2018-08-06 11:07:09,923 INFO apt version: '1.2.26'
2018-08-06 11:07:09,924 INFO python version: '3.5.2 (default, Nov 23 2017, 16:37:01)
[GCC 5.4.0 20160609]'
2018-08-06 11:07:09,926 INFO release-upgrader version '18.04.22' started
Here are the test results from an Ubuntu 16.04 with an old version of snapd and using the version of the dist-upgrader from bionic-proposed.
bdmurray@ clean-xenial- amd64:~ /u-r-u$ tail -n 20 /var/log/ dist-upgrade/ screenlog. 0
Outdated snapd package
Your system does not have the latest version of snapd. Please update
the version of snapd on your system to improve the upgrade
experience.
Do you still want to continue with the upgrade?
Continue [yN] -- 0:bionic -- time-stamp -- Aug/06/18 11:09:39 --
-- 0:bionic -- time-stamp -- Aug/06/18 11:13:02 --
N
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Mon Aug 6 11:13:04 2018) ===bdmurray@ clean-xenial- amd64:~ /u-r-u$ head -n20 /var/log/ dist-upgrade/ main.log e.cfg.xenial' ]'
2018-08-06 11:07:09,619 INFO Using config files '['./DistUpgrad
2018-08-06 11:07:09,619 INFO uname information: 'Linux clean-xenial-amd64 4.4.0-121-generic #145-Ubuntu SMP Fri Apr 13 13:47:23 UTC 2018 x86_64'
2018-08-06 11:07:09,923 INFO apt version: '1.2.26'
2018-08-06 11:07:09,924 INFO python version: '3.5.2 (default, Nov 23 2017, 16:37:01)
[GCC 5.4.0 20160609]'
2018-08-06 11:07:09,926 INFO release-upgrader version '18.04.22' started