Last day my PC become very slow to boot.
boby@ok-pc-01:~$ systemd-analyze Startup finished in 15.777s (kernel) + 3min 1.400s (userspace) = 3min 17.178s graphical.target reached after 1min 47.169s in userspace boby@ok-pc-01:~$
It take 3 minutes and 17 seconds to boot up.
This happend after i did some changes to my 2nd hard disk and added ZFS partition. First thing i thought it was ZFS that make my PC slow.
systemd-analyze blame did not show any useful info.
systemd-analyze blame
To find the problem, i edited the file
sudo vi /etc/defaults/grub
Find the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Replace it with
GRUB_CMDLINE_LINUX_DEFAULT=""
Now rebuild grub.cfg with
update-grub2
Rebooted the PC. Now instead of showing Ubuntu splash screen, you get lot of text, that shows what actually your PC is doing.
From the boot message i found system waiting 1 minutes 30 seconds for mounting one of the disk partition. This is because i re-partitioned my 2nd hard disk and forget to remove the disk from /etc/fstab.
I removed the non existant disk entry from /etc/fstab and rebooted PC. Now it boot much faster.
See Ubuntu