When I enter correct password display blinks and return me back to the login page. I'm positive that password is correct.

There're no any error messages or something like that.

I tried to find the solution before asking but this is the case when I found too much answers and my experiance with Ubuntu is so limited that I just don't know what (and how exactly) should I do first.

***OS***: Ubuntu 20.04

*Update 1*

I tried to follow an instruction from [How to Fix the Ubuntu Login Loop](https://www.maketecheasier.com/fix-ubuntu-login-loop/) article

but

```
ls -lah | grep -i Xauthority
```

command didn't return anything.

*Update 2*

I tried some suggestions from [Login loop after installing 20.04](https://askubuntu.com/questions/1229821/login-loop-after-installing-20-04)

a)

```
sudo apt-get purge chrome-remote-desktop
```

(I haven't that package)

b) 

```
sudo apt-get purge 'nvidia.*'
```

I wasn't able to retrieve the package.

c)

```
sudo apt install nvidia-driver-440
```

packages were updated / replaced but with no effect to the issue.

d)

```
sudo apt-get install lightdm
```

after that login page looks differently but the loop is still here.