Slow booting after version upgrade.

[rocco.martinello]

Hi to all!
After upgrading to Ubuntu 18.10 from 18.04.1 LTS booting is too long.
How can I diagnose and fix this problem?
Thank you in advance for your help!!!

[oldfred]

Were you mounting any partitions in fstab that now have different UUID or are missing. It has to timeout if so.
Have you housecleaned system, both before upgrade & after?

What does this show:
systemd-analyze

Only need to see top 10 or so, q to stop ( I now have 7 sec on printer config):
systemd-analyze blame

If not using snaps, I removed them:
boot time cut in half by removing snap
https://ubuntuforums.org/showthread.php?t=2391341

[rocco.martinello]

Hi oldfred and thank you very much for your answer!!!
I deleted the default swap file and set a swap partition created by me. Strangely this partition seems to have no UUID so I set PARTUUID in fstab to make the partition work. This modification works and neither UUID nor PARTUUID were modified.
What do you mean with “housecleaned” and how can I do this?

Systemd-analyze shows:
Startup finished in 74us (firmware) + 62us (loader) + 34.474s(kernel) + 57.465s (userspace) = 1min 31.939sgraphical.target reached after 57.386s in userspace
systemd-analyze blame shows:

26.333s plymouth-quit-wait.service 12.671s dev-sda6.device 9.369s udisks2.service 9.098s ModemManager.service 8.656s networkd-dispatcher.service 8.202s dev-loop13.device 7.776s accounts-daemon.service 7.618s dev-loop18.device 7.574s dev-loop21.device 7.574s dev-loop17.device 7.538s dev-loop16.device 7.457s dev-loop14.device 7.457s dev-loop20.device
Thank you in advance for your answer!

[oldfred]

Are you using snaps?
https://askubuntu.com/questions/1039411/how-can-i-replace-snap-application-such-as-gnome-calculator-with-a-deb
boot time cut in half by removing snap
https://ubuntuforums.org/showthread.php?t=2391341

https://sites.google.com/site/easylinuxtipsproject/clean
Do yourself a favor and avoid bleachbit.
Updates, backups, delete old kernels - TheFu in Forums
http://blog.jdpfu.com/2011/06/24/system-maintenance-for-linux-pcs
https://help.ubuntu.com/community/RemoveOldKernels
RecoverLostDiskSpace
https://help.ubuntu.com/community/RecoverLostDiskSpace
HOWTO: Recover Lost Disk Space - drs305
http://ubuntuforums.org/showthread.php?t=1122670
http://ubuntuforums.org/showthread.php?t=898573
HOWTO: Cleaning up all those unnecessary junk files...
http://ubuntuforums.org/showthread.php?t=140920

Caution deborphan will delete anything you manually installed. See comment: