It's been a few days since I've installed Ubuntu for the first time and the boot time is quite slow. I read many threads about it and tried different ways to solve the problem but nothing worked, I improved the boot time only by a few seconds.
I already reduced the time configuration in /etc/systemd/system.conf and uninstalled all the apps I don't use but nothing changed.
This is what I get with systemd-analyze
Startup finished in 7.504s (kernel) + 1min 5.807s (userspace) = 1min 13.312s
graphical.target reached after 1min 5.083s in userspace
then, systemd-analyze blame
31.467s plymouth-quit-wait.service
22.757s dev-sda1.device
16.636s snapd.service
15.032s networkd-dispatcher.service
12.792s apparmor.service
12.510s NetworkManager-wait-online.service
10.454s dev-loop1.device
10.395s systemd-journal-flush.service
10.330s dev-loop6.device
10.271s dev-loop2.device
10.262s dev-loop4.device
9.820s dev-loop7.device
9.571s NetworkManager.service
9.335s dev-loop0.device
9.247s dev-loop5.device
8.671s dev-loop3.device
8.161s accounts-daemon.service
7.885s ModemManager.service
7.416s grub-common.service
5.546s udisks2.service
4.756s systemd-logind.service
4.715s pppd-dns.service
3.504s thermald.service
lastly, systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
graphical.target @1min 5.083s
└─multi-user.target @1min 5.082s
└─kerneloops.service @46.043s +107ms
└─network-online.target @46.030s
└─NetworkManager-wait-online.service @33.511s +12.510s
└─NetworkManager.service @23.911s +9.571s
└─dbus.service @19.906s
└─basic.target @19.810s
└─sockets.target @19.809s
└─snapd.socket @19.707s +101ms
└─sysinit.target @19.691s
└─apparmor.service @6.897s +12.792s
└─local-fs.target @6.785s
└─run-user-121.mount @40.677s
└─local-fs-pre.target @6.241s
└─keyboard-setup.service @4.392s +1.848s
└─systemd-journald.socket @4.231s
└─system.slice @4.227s
└─-.slice @4.177s
Could I disable any of the following services or would it be too dangerous?:
plymouth-quit-wait.service
dev-sda1.device
snapd.service
networkd-dispatcher.service
