Long boot delay on Ubuntu loading/splash screen following regular dist-upgrade on clean SSD install (18.04)

This is a kernel related regression, the launchpad bug is: https://bugs.launchpad.net/ubuntu/+bug/1779827

As a workaround, press keys and/or move the mouse at boot.

In a nutshell services that use /dev/urandom or getrandom() now block until enough entropy is available. In the past much less entropy was required for /dev/urandom.

The latest status from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779961/comments/5 is that:

The meta-packages have been rolled back and the fix is in progress of being applied and uploaded.

The snapd team also looked into this and worked with bson upstream to ensure no /dev/unrandom is needed to startup (https://github.com/snapcore/snapd/pull/5464)

So this problem should be fixed via either a kernel or a snapd update soon.

You can move mouse or increase entropy in system.

sudo apt install haveged

haveged website

Works for default kernel and from ukuu. This allows the system to boot up correctly on kernel 4.17.4.

i've the same issue with 4.15.0-24-generic #26-Ubuntu SMP

user@nb:~$ systemd-analyze blame |head
         4min 2s plymouth-quit-wait.service
          1.440s systemd-udev-settle.service
           562ms dev-sda1.device
           313ms udisks2.service
           240ms systemd-rfkill.service
           231ms NetworkManager.service
           194ms networkd-dispatcher.service
           180ms systemd-backlight@backlight:acpi_video0.service
           179ms systemd-journal-flush.service
           147ms systemd-logind.service

For a temporary workaround, you just need to move your mouse / touchpad while booting, resulting in a "normal" boot time; in my case:

user@nb:~$ systemd-analyze blame |head
          1.440s systemd-udev-settle.service
           882ms plymouth-quit-wait.service
           562ms dev-sda1.device
           313ms udisks2.service
           240ms systemd-rfkill.service
           231ms NetworkManager.service
           194ms networkd-dispatcher.service
           180ms systemd-backlight@backlight:acpi_video0.service
           179ms systemd-journal-flush.service
           147ms systemd-logind.service

Fix Source: https://ubuntuforums.org/showthread.php?t=2395451&p=13780509#post13780509