Feature request: Better start up time of Ubuntu like on version 16.04

[Ralf Mardorf]

On Thu, 2020-11-12 at 08:19 +0100, Damian wrote:
> > some versions ago (16.04) a cold start to me 16 seconds.
> > With all later versions even with SSD harddrives it takes over a
> > minutes.
> 
> Which time frame do you measure that takes a minute? I measure 15
> seconds from hitting enter in grub and seeing my desktop wallpaper.

$ systemd-analyze blame

might be a starting point. OTOH it provides some quite useless
information. I fore example get...

$ systemd-analyze blame
2min 30.756s fstrim.service                        
     19.498s man-db.service                        
     14.584s alice-dhcp.service                    
      3.478s lvm2-monitor.service                  
      3.292s dev-sdc1.device                       
      1.060s systemd-random-seed.service           
       718ms upower.service                        
       654ms systemd-logind.service                
       650ms lightdm.service
[snip]

...actually it much like took less than 10 seconds to boot and start an
openbox session and even if I should be mistaken and it took longer,
without doubts it was less than 1 minute.

However, even if some units take longer, a session can start, but some
units probably need to finish a process before a session can start.

Trimming and establishing an Internet connection by DHCP needs not to be
finished to start a session, but other services probably first need to
initial things, before a session can be started.