4

On my MacBook Air, I upgraded from Ubuntu 16.04 to Ubuntu 18.04. Everything is fine, but booting with Ubuntu takes approx. 6 minutes!

Running $ systemd-analyze time outputs:

Startup finished in 4.480s (kernel) + 6min 545ms (userspace) = 6min 5.026s
graphical.target reached after 6min 535ms in userspace

The final part of $ systemd-analyze time:

...
[    7.005447] Bluetooth: BNEP socket layer initialized
[    7.354030] IPv6: ADDRCONF(NETDEV_UP): enx00e04c6800c5: link is not ready
[    7.359359] IPv6: ADDRCONF(NETDEV_UP): enx00e04c6800c5: link is not ready
[    7.363620] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
[    8.977999] r8152 2-1.4:1.0 enx00e04c6800c5: carrier on
[    8.978018] IPv6: ADDRCONF(NETDEV_CHANGE): enx00e04c6800c5: link becomes ready
[  359.996525] random: crng init done
[  693.520385] thunderbolt 0000:07:00.0: resetting error on 0:b.
[  693.520465] thunderbolt 0000:07:00.0: 0:b: hotplug: scanning
[  693.520471] thunderbolt 0000:07:00.0: 0:b: hotplug: no switch found
[  693.820626] thunderbolt 0000:07:00.0: resetting error on 0:b.
[  693.820711] thunderbolt 0000:07:00.0: 0:b: got unplug event for disconnected port, ignoring
[ 1338.638266] thunderbolt 0000:07:00.0: resetting error on 0:b.
[ 1338.638283] thunderbolt 0000:07:00.0: 0:b: hotplug: scanning
[ 1338.638288] thunderbolt 0000:07:00.0: 0:b: hotplug: no switch found
[ 1338.938543] thunderbolt 0000:07:00.0: resetting error on 0:b.
[ 1338.938568] thunderbolt 0000:07:00.0: 0:b: got unplug event for disconnected port, ignoring
[ 1357.411889] Bluetooth: RFCOMM TTY layer initialized
[ 1357.411894] Bluetooth: RFCOMM socket layer initialized
[ 1357.411900] Bluetooth: RFCOMM ver 1.11
[ 1358.945100] rfkill: input handler disabled

The etc/fstab file:

...
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda4 during installation
UUID=2ef34bb8-5360-460a-8a8a-646d3a102a3a /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=67E3-17ED  /boot/efi       vfat    umask=0077      0       1
# swap was on /dev/sda5 during installation
UUID=7c820859-65c5-44ac-9704-b3e0bb8c8020 none            swap    sw              0       0

How can I further troubleshoot and possibly solve this problem? Thank you in advance.

Mario

user2364174
  • 141

1 Answers1

2

I've seen this manifest on two desktops I manage.

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. This will increase the randomness entropy.

Or running the following command to install rng-tools solves the issue for me:

sudo apt install rng-tools

From Arch wiki: The rng-tools is a set of utilities related to random number generation in kernel. This is mainly useful to increase the quantity of entropy in kernel to make /dev/random faster.

psiphi75
  • 976