Ubuntu – Getting a very slow startup on Ubuntu 20. Seems to be stuck around the stage where the Gnome screen appears

My system is:

• Ubuntu 20.04.1 LTS on a dedicated SSD (no virtual machine)
• Intel® Core™ i7-4770 CPU @ 3.40GHz × 8 with 31.3 GiB

I use the default setting BIOS (ASUS motherboard). I did not do any overclock etc.

Here are the steps when I start Ubuntu:

1. Very Slow: Waiting a very long time (approximately 2 min 20 sec) with a Ubuntu Gnome screen. See screenshot.
2. Enter username + password and submit.
3. Very Fast: Once username + password submited wait a bit until to use the system.

Many posts suggest to enter a systemd-analyze blame, but as you see below the process that takes the longest last 6 second and the next ones approx 1 second. So I am not expert but I guess hat this analysis is more to analyze issues from step 2 to 3. But my issue seems to be more between step 1 and 2. In addition if I sum up all the system analysis blame I even not end up to 1 min wheras step 1 to 2 takes approx 2 minutes and 20 seconds.

6.482s NetworkManager-wait-online.service                  
1.050s snap-gtk\x2dcommon\x2dthemes-1502.mount
1.050s snap-gnome\x2d3\x2d34\x2d1804-36.mount 
1.005s snap-whatsdesk-19.mount                
 937ms snap-core18-1885.mount                 
 934ms snap-core18-1932.mount                 
 932ms snap-gnome\x2d3\x2d28\x2d1804-128.mount
 848ms snap-gnome\x2d3\x2d34\x2d1804-60.mount 
 756ms snap-gtk2\x2dcommon\x2dthemes-9.mount 
etc

I have tried to use a totally different SSD drive with windows 10 and it took me approx 7 seconds to get windows system running.

I started with Ubuntu 16 LTS then 18 LTS and now 20 LTS. So it is not a fresh start with Ubuntu 20. But if possible I want to avoid to try to install Ubuntu from scratch…

Once started the system is very reactive and very fast (no issues). Issue is slow startup.

I have also removed the Ubuntu Gnome background in step 1(by removing the split splach in the grub config) and I see that what takes 1 minute and 30 seconds I get this message:

A start job is running for /dev/disk/by-uuid/fc18b..........

I have now something to investigate further.