Support needed for bricked login - “Oh no! Something went wrong” screen

Recently, I've had to flush my disks due to a Windows update bug and I had lost my Ubuntu 20.04 disk, which worked perfectly. However, after installing Windows and Linux again, and trying to set up Ubuntu 20.04, I've received multiple times the brick screen "Oh no! Something went wrong" when trying to login, after changing some settings of gnome, such as dock or desktop icons (yeah, it's unbeliavable that the brick is being caused by gnome settings, but it's true since I tested it reinstalling 20.04 and only changing gnome settings; after rebooting, the brick screen appeared.

I have tried solutions found in post like [this][1] or [this][2], but none of them worked. Since I'm not an experienced Linux user, I'm feeling lost when trying to debug what is going on, such as greping `/var/log/` files, but I don't not where neither what to search. I'm still providing the content of `syslog` file with `grep error`, just in case any helpful information relies [there][3].

If anybody could help me solving this problem I would be so grateful, I've been struggling with this for weeks and after asking in many forums and not getting response, I'm a little bit desperate, since I can't work in my job without my Ubuntu desktop :(

So please, if I can provide any information that could be useful, ask me and I'll do it as quickly as I can.

[UPDATE]: Here you can see the content of crash file (_usr_sbin_gdm3.0.crash): [link][4].

  [1]: https://askubuntu.com/questions/1239025/after-upgrade-to-ubuntu-20-04-oh-no-something-went-wrong
  [2]: https://superuser.com/questions/917377/how-do-i-fix-oh-no-something-has-gone-wrong-gdm3-fails-to-start
  [3]: https://hastebin.com/raw/ojafazuyez
  [4]: https://controlc.com/914ae515