Ubuntu – Ubuntu 20.04 LTS slow boot


I recently upgraded from ubuntu 18.04 to 20.04. The booting takes very long and while opening applications for the first time after boot takes a while. This was not the case in 18.04.
Here is the output of systemd-analyze blame.

40.177s plymouth-quit-wait.service
13.821s networkd-dispatcher.service
12.331s dev-sda7.device
11.938s snapd.service
10.914s udisks2.service
9.756s apport-autoreport.service
9.003s accounts-daemon.service
6.878s ModemManager.service
5.834s dev-loop9.device
5.799s dev-loop15.device
5.622s avahi-daemon.service
5.620s bluetooth.service
5.533s iio-sensor-proxy.service
5.476s dev-loop4.device
5.452s dev-loop7.device
5.441s dev-loop8.device
5.368s NetworkManager.service
5.357s polkit.service
5.245s dev-loop16.device
5.164s dev-loop14.device
5.126s dev-loop0.device
5.125s dev-loop2.device
5.122s dev-loop13.device

Here is the output for systemd-analyze critical-chain

graphical.target @1min 6.301s
└─multi-user.target @1min 6.301s
└─networkd-dispatcher.service @20.621s +13.821s
└─basic.target @19.895s
└─sockets.target @19.895s
└─snapd.socket @19.894s +646us
└─sysinit.target @19.762s
└─systemd-timesyncd.service @19.415s +346ms
└─systemd-tmpfiles-setup.service @17.088s +2.324s
└─local-fs.target @17.084s
└─run-snapd-ns-canonical\x2dlivepatch.mnt.mount @31.721s
└─run-snapd-ns.mount @29.157s
└─local-fs-pre.target @5.700s
└─systemd-tmpfiles-setup-dev.service @4.740s +960ms
└─systemd-sysusers.service @3.947s +792ms
└─systemd-remount-fs.service @3.604s +136ms
└─systemd-journald.socket @3.532s
└─-.mount @3.515s
└─system.slice @3.515s
└─-.slice @3.515s

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