Lubuntu is stuck on loop

I installed Unity using sudo apt install ubuntu-desktop command. It worked at first but when i rebooted the computer, it doesn’t give me the option to use Lubuntu Desktop environment, it’s just stuck on Unity environment and it doesn’t even launch properly, it gets stuck on purple screen when i enter password. Does anyone have any idea to fix that?

Edit: I executed the command “ls -al /usr/share/xsessions/” and here is the list:

Lubuntu.desktop
openbox.desktop
ubuntu-communitheme-snap.desktop
ubuntu.desktop

I also executed the commands that were in the answers but still no change. I included the picture of my screen now. And my Lubuntu is 18.04, modern.

https://i.stack.imgur.com/EXPJm.jpg


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Author Of this post: Berkay Demirci
Title Of post: Lubuntu is stuck on loop
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