Oh, found it. With sudo gtk-update-icon-cache -f /usr/share/icons/hicolor you can regenerate the icon cache, gconftool-2 --recursive-unset /apps/panel resets the icons.
-- Symbols in Gnome panel disappeared https://bugs.launchpad.net/bugs/186222 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs