Ubuntu启动慢问题解决方法

最近Ubuntu的启动简直是慢得要命，起码15分钟。上网找到方法，具体操作如下：

12345678910111213141516171819202122232425262728293031323334353637systemd-analyze blame# 用于导出下面的开机时间结果5min 3.650s plymouth-quit-wait.service #问题启动服务1 5min 51ms vboxadd.service #问题启动服务2 50.933s apt-daily-upgrade.service #问题启动服务3 3.072s mysqld.service 1.674s snapd.service 766ms dev-loop16.device 744ms snapd.seeded.service 722ms dev-sda3.device 669ms NetworkManager-wait-online.service 668ms dev-loop4.device 667ms dev-loop6.device 666ms dev-loop7.device 603ms logrotate.service 603ms dev-loop5.device 602ms dev-loop1.device 585ms dev-loop2.device 582ms dev-loop3.device 581ms udisks2.service 566ms dev-loop0.device 555ms e2scrub_reap.service 544ms networkd-dispatcher.service 535ms systemd-logind.service 465ms ufw.service 455ms fwupd.service 434ms accounts-daemon.service 420ms man-db.service 354ms ModemManager.service 335ms snapd.apparmor.servicelines 1-28# 这个语句看到开机总时间brian@brian-ubuntu:~$ systemd-analyzeStartup finished in 1.816s (kernel) + 4.427s (userspace) = 6.244s graphical.target reached after 4.400s in userspace

12345678# 用这个语句来关闭启动服务，效果杠杠的brian@brian-ubuntu:~$ sudo systemctl mask plymouth-quit-wait.service[sudo] brian 的密码： Created symlink /etc/systemd/system/plymouth-quit-wait.service → /dev/null.brian@brian-ubuntu:~$ sudo systemctl mask vboxadd.serviceCreated symlink /etc/systemd/system/vboxadd.service → /dev/null.brian@brian-ubuntu:~$ sudo systemctl mask apt-daily-upgrade.serviceCreated symlink /etc/systemd/system/apt-daily-upgrade.service → /dev/null.

plymouth-quit-wait.service和vboxadd.service在Deepin中启动只需要半秒不到，不知道为啥在Ubuntu和LinuxMint为啥要这么久

参考链接：ubuntu开机，关机慢解决方法