I tried to change a user's login name with usermod --login krypton maddybut now everytime I reboot my pc, it doesn't directly shows the desktop environment and I need to do Ctrl+Alt+F2 and then startx and when I run who I get previous username at the top:

krypton@Elementalx:~/Desktop$ usermod --login krypton impulse
usermod: user 'impulse' does not exist
krypton@Elementalx:~/Desktop/Black Hole$ who
impulse                 2019-08-11 22:50
krypton  tty2         2019-08-11 22:52
krypton  pts/0        2019-08-11 22:53 (:1)
krypton  pts/1        2019-08-11 22:56 (:1)

how do I fix it.

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