引导图不再可用？是否有等效的图形工具？
sudo apt install bootchart
E: Package 'bootchart' has no installation candidate
sudo snap install bootchart
error: snap "bootchart" not found
我的分析链似乎根本没有帮助：
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 @17.301s
└─multi-user.target @17.301s
└─snap-node-2082.mount @56.794s +60ms
└─local-fs-pre.target @1.903s
└─keyboard-setup.service @226ms +1.367s
└─systemd-journald.socket @224ms
└─system.slice @218ms
└─-.slice @218ms