purge out gnome extensions manually
I have encountered a very annoying problem that I can not delete some of the gnome-extensions clearly, which caused my gnome software abnormally performed.
some articles will tell you to use
gnome-tweak-tool to remove or configure gnome-extensions, I agree with this in a half that this tool can only remove plugins that are performing normally.
The extensions can be seem on
gnome-tweak-tool but shows
ERROR, can not either remove or enable.
While there is no other tool to remove extensions, this article is to tell you a little trick to remove all abnormal extensions from you system.
after googling for a very long time, I got to know that to cope with the
situation of abnormally running plugins, you have to use
gsettings get org.gnome.shell enabled-extensions #to get all enabled extensions
gsettings set org.gnome.shell enabled-extensions  #to clear all enabled extensions
after this command you can reinstall all your gnome-extensions.