Jtdcftul

I need some help. When i try to upgrade ubuntu 16.04 to 18.04 via update manager, It shows an X mark and closes on the preparing stage. And when i try it via terminal. I get this:

Checking package manager

Reading package lists... Done

Building dependency tree        

Reading state information... Done

Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       

Fetched 0 B in 0s (0 B/s)                                                      

Reading package lists... Done    

Building dependency tree          

Reading state information... Done



Restoring original system state



Aborting

Reading package lists... Done    

Building dependency tree          

Reading state information... Done

Can someone please help me? Thanks.

EDIT: Oh, And btw. I lost my usb. So i can't do a clean install. And my system is a Dell Latitude E7240.

File /var/log/dist-upgrade/main.log:

2018-09-26 13:58:15,662 INFO Using config files '['./DistUpgrade.cfg.xenial']'

2018-09-26 13:58:15,663 INFO uname information: 'Linux rami-Latitude-E7240 4.4.0-135-generic #161~14.04.1-Ubuntu SMP Tue Aug 28 11:17:49 UTC 2018 x86_64'

2018-09-26 13:58:15,754 INFO apt version: '1.2.10ubuntu1'

2018-09-26 13:58:15,755 INFO python version: '3.5.1+ (default, Mar 30 2016, 22:46:26) 

[GCC 5.3.1 20160330]'

2018-09-26 13:58:15,756 INFO release-upgrader version '18.04.24' started

2018-09-26 13:58:15,840 INFO locale: 'en_US' 'UTF-8'

2018-09-26 13:58:16,158 DEBUG Using 'DistUpgradeViewGtk3' view

2018-09-26 13:58:16,214 DEBUG enable dpkg --force-overwrite

2018-09-26 13:58:16,234 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'

2018-09-26 13:58:17,061 DEBUG lsb-release: 'xenial'

2018-09-26 13:58:17,061 DEBUG _pythonSymlinkCheck run

2018-09-26 13:58:17,062 DEBUG openCache()

2018-09-26 13:58:17,062 DEBUG No such plugin directory: ./plugins

2018-09-26 13:58:17,062 DEBUG plugins for condition 'PreCacheOpen' are ''

2018-09-26 13:58:17,062 DEBUG plugins for condition 'bionicPreCacheOpen' are ''

2018-09-26 13:58:17,062 DEBUG plugins for condition 'from_xenialPreCacheOpen' are ''

2018-09-26 13:58:17,062 DEBUG quirks: running PreCacheOpen

2018-09-26 13:58:17,062 DEBUG running Quirks.PreCacheOpen

2018-09-26 13:58:17,342 DEBUG /openCache(), new cache size 12180

2018-09-26 13:58:17,342 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')

2018-09-26 13:58:17,343 DEBUG checkViewDepends()

2018-09-26 13:58:17,343 DEBUG running doUpdate() (showErrors=False)

2018-09-26 13:58:17,805 DEBUG openCache()

2018-09-26 13:58:18,083 DEBUG /openCache(), new cache size 12180

2018-09-26 13:58:18,083 DEBUG doPostInitialUpdate

2018-09-26 13:58:18,083 DEBUG plugins for condition 'PostInitialUpdate' are ''

2018-09-26 13:58:18,083 DEBUG plugins for condition 'bionicPostInitialUpdate' are ''

2018-09-26 13:58:18,083 DEBUG plugins for condition 'from_xenialPostInitialUpdate' are ''

2018-09-26 13:58:18,084 DEBUG quirks: running bionicPostInitialUpdate

2018-09-26 13:58:18,084 DEBUG running Quirks.bionicPostInitialUpdate

2018-09-26 13:58:18,119 DEBUG abort called

2018-09-26 13:58:18,120 DEBUG openCache()

2018-09-26 13:58:18,120 DEBUG failed to SystemUnLock() (E:Not locked) 

2018-09-26 13:58:18,404 DEBUG /openCache(), new cache size 12180

Still researching but running it all under strace suggests that the last failure before the Abort is trying to run something snap related - /tmp/ubuntu-release-upgrader-9dqwuool/imported/snap debug connectivity which is dying with error: cannot communicate with server: Post http://localhost/v2/debug: dial unix /run/snapd.socket: connect: connection refused

Ah, in fact, snap debug connectivity blows up when run directly, service snapd status says Active: failed (Result: start-limit-hit); running service snapd start results in a status of Active: active (running) and then snap debug connectivity says Connectivity status: * PASS... and then do-release-upgrade actually makes progress.

Based on other search results, please note that this only applies if your main.log goes immediately from running Quirks.bionicPostInitialUpdate to abort called -- if there's anything else in there it's probably not this.

It looks like this might relate to https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1780841 (which seems to be what implements the feature that doesn't work here.)

I had the same issue, Ubuntu 16 LTS to Ubuntu 18.04 LTS upgrade failed to start.

Using the graphical upgrade tool it stops quickly after 'preparing', not saying anything.

Using do-release-upgrade it stops at:
2019-03-08 23:55:58,515 DEBUG running Quirks.bionicPostInitialUpdate
2019-03-08 23:55:58,524 DEBUG abort called

It proved to be the snap daemon not running (systemctl status snapd) on my system causing the upgrade to fail without further notice.