待写
https://outhereinthefield.wordpress.com/2008/02/02/moving-usr-var-to-another-partition/
https://askubuntu.com/questions/656/how-to-move-usr-to-a-new-partition
https://askubuntu.com/questions/1167612/ubuntu-doesnt-boot-after-moving-usr-from-hdd-to-ssd-nvme
https://serverfault.com/questions/597779/mount-usr-on-different-partition
https://blog.csdn.net/github_33809414/article/details/85207300?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.add_param_isCf&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.add_param_isCf
