linux - mac上的ubuntu虚拟机，关机之后再开机，无限循环登录界面

Question

之前一直没有关机过，都是直接在parallels上点中止，然后下次恢复。这次关了机，再开机，发现输入密码正确，总是黑屏闪了一下又会跳回登录界面，又让我输密码。。。试了很多网上的方法，比如改etc/profile和etc/environment；更改.Xauthority的权限；重装显卡驱动；更改/tmp的权限；更改/home的权限；全都试过了，都没用，我都绝望了，我的代码都还在里面，逼我重装系统？那我要把代码拷出来？但是环境又要重新搭。。。。哎，无语，到底问题出在了哪？谁来救救我，好绝望

Answer 1

After booting, enter the grub interface, change to single-user mode and then start. See if you can log in normally.
After that, check each startup script to see if there are any loop restart exceptions. If it is a graphical interface, check whether the permissions of the /tmp directory are correct, which requires 1777 permissions.