My system is a bit older. I use Kubuntu which is somewhat lighter weight. I had to run systemd-analyze and blame multiple times and research each entry. Best to make one change at a time to make sure system still is ok. Found SSD makes huge difference. If you can upgrade to SSD best to do that also.
Made sure UEFI firmware & SSD firmware at latest versions
Compare to vendors support site
sudo dmidecode -s bios-version
udisksctl status
Now my system show this. It actually now takes about 25 sec for full shutdown & reboot. Not sure where the 44 min is coming from, have not seen that before.
fred@z170-noble:~$ systemd-analyze
Startup finished in 44min 46.692s (firmware) + 5.383s (loader) + 4.112s (kernel) + 4.001s (userspace) = 45min 190ms
graphical.target reached after 3.987s in userspace.
/etc/default/grub changed from quiet splash to noplymouth, will see boot process rather than Ubuntu logo,
sudo systemctl disable NetworkManager-wait-online.service
remove snaps (many here prefer snaps)
If UEFI firmware update not supported (yet)
sudo apt-get purge fwupd
My system does not have Thunderbolt
systemctl mask bolt.service
disable unused devices:
journalctl -b | grep udisks
Check all UUIDs are correct in fstab. Often happens with another install that reformats swap or incorrect/typo entry. I now prefer labels.
If old BIOS only system with core2 Duo, there has been a kernel bug.
https://www.phoronix.com/news/Intel-Core-2-Stalls-Boot-Fix
Advanced changes:
https://wiki.archlinux.org/title/Improving_performance/Boot_process
Other references:
https://askubuntu.com/questions/1284302/is-it-possible-to-make-ubuntu-20-04-boot-faster