Firefox仅能通过终端启动，图形化点击无响应问题求助

大家好，我碰到了一个Firefox的启动故障，想请教下各位大佬怎么解决：

• 点击桌面或应用列表里的Firefox图标完全没反应，一点动静都没有
• 只能通过终端输入命令启动Firefox，启动时会弹出一堆警告信息，具体输出如下：

$ firefox

Gtk-Message: 14:15:43.815: Failed to load module "xapp-gtk3-module"

(firefox:11586): Gtk-WARNING **: 14:15:43.865: Theme parsing error: gtk.css:1:21: Failed to import: Error opening file /home/roy/snap/firefox/3131/.config/gtk-3.0/colors.css: No such file or directory

Gtk-Message: 14:15:43.881: Failed to load module "window-decorations-gtk-module"

Gtk-Message: 14:15:43.881: Failed to load module "colorreload-gtk-module"

ATTENTION: default value of option mesa_glthread overridden by environment.

ATTENTION: default value of option mesa_glthread overridden by environment.

[Parent 11586, Main Thread] WARNING: Unable to connect to ibus: Could not connect: Connection refused: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:167

(firefox:11586): IBUS-WARNING **: 14:15:44.049: Unable to connect to ibus: Could not connect: Connection refused

我自己也查了资料，看到有人说要安装xapp，于是执行了下面的命令，但结果提示找不到这个包，而且它的替代包我都已经装了，甚至还装了python3-xapp，但问题还是没解决：

$ sudo apt install xapp

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

Package xapp is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source

However the following packages replace it:

xapp-sn-watcher libxapp-gtk3-module

E: Package 'xapp' has no installation candidate

有没有朋友遇到过类似的问题？麻烦给点解决思路，谢谢啦！

备注：内容来源于stack exchange，提问作者Roy van Empel