Home / ubuntu / Questions / 1247213
In Process
Aaryan BHAGAT
Asked: 2020-06-06 06:07:34 +0800 CST

resolvconf-pull-resolved.service and plymouth-quit-wait.service slows down my ubuntu 20.04

  • 772

The problem is resolveconf-pull-resolved.service and plymouth-quit-wait.service are taking a lot of time to start making the overall boot process slow. The first one upon searching, I found various issues where it caused the boot to stuck there but none where it caused the boot to be slow overall, for the 2nd one I found this answer which says that this service is not at fault as it just waits for others to complete.
The whole process of my investigation is explained below:

systemd-analyze time gives the following output:

Startup finished in 7.870s (firmware) + 3.118s (loader) + 19.467s (kernel) + 1min 56.978s (userspace) = 2min 27.435s 
graphical.target reached after 1min 56.840s in userspace

Upon following this answer regarding slow userspace, mine problem was similar (meaning snapd was one of the main culprits for slow down ) as systemd-analyze blame | grep snapd gave the following output:

26.656s snapd.service                                                            
      1.011s snapd.apparmor.service                                                   
       915ms snapd.seeded.service                                                     
         1ms snapd.socket

and systemd-analyze blame | grep dev-loop gave

10.384s dev-loop19.device                                                        
     10.236s dev-loop9.device                                                         
     10.155s dev-loop0.device                                                         
     10.151s dev-loop16.device                                                        
     10.110s dev-loop14.device                                                        
      9.776s dev-loop13.device                                                        
      9.470s dev-loop15.device                                                        
      9.294s dev-loop12.device                                                        
      9.106s dev-loop6.device                                                         
      8.982s dev-loop17.device                                                        
      8.873s dev-loop11.device                                                        
      8.864s dev-loop10.device                                                        
      8.738s dev-loop8.device                                                         
      8.731s dev-loop18.device                                                        
      8.724s dev-loop21.device                                                        
      8.052s dev-loop3.device                                                         
      8.017s dev-loop2.device                                                         
      5.861s dev-loop5.device                                                         
      5.374s dev-loop1.device                                                         
      4.883s dev-loop4.device

But if we look at the whole plot in the svg file ( I have posted the link as uploading the whole image here would make it unreadable because of the size compression ) resolveconf-pull-resolved.service and plymouth-quit-wait.service still take more time than them. Below I have posted a screenshot showing the relevant section of the svg file.enter image description here

plymouth boot resolvconf 20.04

1 Answers

  1. I had a similar situation yesterday and after some cleanup resolveconf-pull-resolved.service disappeared from the list and plymouth-quit-wait.service went back to third place. These are the steps I followed:

    1. Remove all snaps installed in the past ($ sudo snap remove xxx) and reinstall the tools using other means like apt or with deb packages. That had a big improvement in my boot time (a lot of loopback devices were turned off). I couldn't completely get rid of snap because I'm using Gnome Desktop and it seems it was installed using snap during the OS installation.This is my minimum snap list.
    2. Stop unused services ($ sudo systemctl stop xxx and $ sudo systemctl disable xxx). In my case, I stopped PostgreSQL (takes a lot of time), I also stopped Apache, InfluxDB and OpenProject (many services related)
    3. Update the configuration of the System Journal following this post.
    4. Update the configuration of apt-daily.service so it triggers after boot. Check this post to know how.

    After all of these actions, my boot time decreased dramatically. I'm thinking of using another Desktop manager like Xfce or uninstalling Gnome Desktop and reinstalling it without using Snaps.

    As a side note, I am surprised at how little time it takes to start an application without snaps, for instance, VLC shows up almost instantly before took some seconds, close to 5-10.

    Hope this helps!

    • 1