Get at text console, pressing Control-Alt-F6 works on a test system I have here 
(other function keys may work). If you still can't login there may be more 
messages pointing at the cause. If you can login then it may be the disk or 
quota is full. It may also be that you added a command to you bash profile that 
doesn't exit (most common case we see is people doing 'exec other-shell') if so 
remove that and try the GUI login again, use Control-Alt-F1 to switch. The next 
major cause tends to be corrupt Gnome config or faulty extensions. The quick 
fix for that is to either delete or move your current Gnome config. This will 
be in ~/.gnome* ~/.gconf* ~/.local ~/.config and maybe elsewhere depending on 
the age of your distribution. These tend to get messed up if you try and use 
them on multiple machines either concurrently (via NFS) or with different Linux 
versions.

On 07/12/2021, 05:38, "Mailing list for Scientific Linux users worldwide on 
behalf of Khaled Ali" <scientific-linux-us...@listserv.fnal.gov on behalf of 
khaled.ali....@st.kyoto-u.ac.jp> wrote:

    My linux is stuck in a login loop when trying to enter my desktop. 
    When I login, the screen gets black and soon after that the login screen 
comes back.

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