This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Using GTK+ 2.x and GTK+ 3 in the same process is not supported . . .

  • 1 reply
  • 1 has this problem
  • 18 views
  • Last reply by cor-el

Albretch
Albretch
more options

I had been using firefox just fine, until I started to get the error message: 

   $ ./firefox -safe-mode &
   [3] 4499

   $ 
   (firefox:4499): Gtk-WARNING **: GTK+ module libgail.so cannot be loaded.
   GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
   close failed in file object destructor:
   sys.excepthook is missing
   lost sys.stderr

   [3]+  Exit 1                  ./firefox -safe-mode
   $ 

How should I troubleshoot such error?

lbrtchx
I had been using firefox just fine, until I started to get the error message: $ ./firefox -safe-mode & [3] 4499 $ (firefox:4499): Gtk-WARNING **: GTK+ module libgail.so cannot be loaded. GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported. close failed in file object destructor: sys.excepthook is missing lost sys.stderr [3]+ Exit 1 ./firefox -safe-mode $ How should I troubleshoot such error? lbrtchx

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

It is likely that you have an old version of libgail.so that is part of GTK+ 2. You will have to check your software update to see if you can install a GTK+ 3 version.