Today I met a strange problem. After I enter my password, the progress bar runs to the end, and it is stuck there forever. No matter how many times I try to restart.
I finally need to go to Recovery mode by pressing
Cmd+R at start up. I then select
Get Help Online to open Safari. Strangely enough I wasn’t connected to Internet
After select the wifi icon on the status bar to connect internet, I then restart and can login again. It seems that macOS is checking for something before allowing user to login