# `sudo chmod 777 -R /usr` Problem ###### tags: `problem solution` [解决普通用户sudo时出现/usr/bin/sudo must be owned by uid 0 and have the setuid bit set](https://www.cnblogs.com/silentdoer/p/8946946.html) If you forget root password: [su Authentication failure解决方法](https://blog.csdn.net/ACK_ACK/article/details/106320127) [WSL2 的 /etc/sudoers 文件改错后：/etc/sudoers: syntax error near line 30](https://blog.csdn.net/Tangramor/article/details/120358727) [How to change default user in WSL Ubuntu bash on Windows 10](https://askubuntu.com/questions/816732/how-to-change-default-user-in-wsl-ubuntu-bash-on-windows-10) ![](https://i.imgur.com/UwBX8O2.png) [sudo: error in /etc/sudo.conf, line 0 while loading plugin 'sudoers_policy'](https://blog.csdn.net/lileihappy/article/details/79214156) --- [zsh compinit: insecure directories and files, run compaudit for list.](https://github.com/zsh-users/zsh-completions/issues/433) [zsh报错：_complete:96: bad math expression: operand expected at end of string](https://blog.csdn.net/Bronze5/article/details/109449532)