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* Use Bootchart to find out slow services/processes:
systemd-analyze time
systemd-analyze blame
systemd-analyze plot > bootchart.svg
* Slow boot due to nonexistent swap partition [https://askubuntu.com/questions/1030867/ubuntu-18-04-how-to-diagnose-fix-very-slow-boot askubuntu.com]:
At some point during the upgrade, the initramfs config was modified, adding a line pointing to a nonexistent swap partition.
The slow boot was because it was looking for this partition and then timing out after 30 seconds.
sudo nano /etc/default/grub
Add '''noresume''' to the below line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash noresume"
sudo update-grub
Reboot the computer
===Miscellaneous===
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