I can't turn on extensions ubuntu 21.04 gnome 40

After installing to ubuntu 21.04, all of my extensions is turn off and I can't turn it on.

Here are my extensions list:

Screenshot 1

I have tried to install gnome-shell-extension, and do a lot of things but I can't turn the extensions on

Also after installing 21.04, the tweaks tool doesn't have the extensions tab:

Screenshot 2


Solution 1:

I resolved this by installing Gnome Tweaks:

Tweaks.

Not sure how it happened, but there was an extensions switch that was disabled:

Disabled extension

After enabling that, all of my extensions started working again.

Solution 2:

Install the Extensions extension or the Extension List extension.