One of the most requested MATE features is the addition of a global menu applet. However, such an applet (called TopMenu) already exists, though it's not available in any PPA and that prevents many Ubuntu / Linux Mint users from installing it.
To make it easier to install, I've packed TopMenu in a PPA for Ubuntu 14.04 (requires using Ubuntu MATE or upgrading to MATE 1.8 via PPA) and 14.10 as well as Linux Mint 17 and 17.1 (MATE edition, obviously).
TopMenu is compatible with MATE 1.8 (a MATE 1.8 panel applet is shipped) and it fully supports GTK2. According to its Wiki page, GTK3 is partially supported (I didn't encounter any functionality issues in my test) and there are additional plugins for Qt4 and Mozilla apps (Firefox and Thunderbird). I should also mention that unlike Unity's AppMenu, TopMenu doesn't autohide and it's always visible when an application is focused.
Here are a few TopMenu screenshots taken under Ubuntu MATE:
|TopMenu - GTK2 app|
|TopMenu - GTK3 app|
|TopMenu - Qt app|
|TopMenu Firefox extension|
For technical information about TopMenu, see its Gitorious page.
Important notes (please read!):
- TopMenu is not considered stable and according to its wiki, GTK3 is only partially supported, so you may encounter bugs or it may not work at all for you;
- I had to tweak TopMenu GTK3 to render properly (some colors were hard-coded and it didn't respect the panel colors) but it's still not perfect and some stuff won't look properly - for instance, when using a transparent panel;
- if you want to remove TopMenu installed from our PPA, use "purge" instead of remove (this should completely remove it: "sudo apt-get purge libtopmenu-*") - that's required to remove the script the package adds under /etc/profile.d/;
- the PPA provides the latest TopMenu from Git;
- TopMenu from our PPA only works with MATE 1.8. To be able to use it in Ubuntu 14.04 (if you don't use Ubuntu MATE 14.04), you'll have to install the latest MATE via PPA.
If you encounter non-packaging related issues, report them HERE.
How to get a global menu under MATE 1.8 with TopMenu in Ubuntu or Linux Mint
1. Install TopMenu
Firstly, let's install TopMenu. To add our PPA and install TopMenu for MATE 1.8 in Ubuntu 14.04 (if you don't use Ubuntu MATE 14.04, you'll have to install MATE 1.8 via PPA), 14.10 or 15.05 / Linux Mint (MATE edition) 17 or 17.1, use the following commands:
sudo add-apt-repository ppa:webupd8team/mate sudo apt-get update sudo apt-get install mate-topmenu-applet
Installing "mate-topmenu-applet" should install all the extra plugins which bring support for GTK3, Qt and Mozilla, which are added them as "recommended" packages (so you're not forced to install all of them). In case some of those plugins are not installed automatically (like in Linux Mint, which doesn't install recommended packages by default), you can use the command below to install them:
sudo apt-get install libtopmenu-gtk3 libtopmenu-qt topmenu-mozilla-extension
Arch Linux users can install TopMenu via AUR: for GTK2 | GTK3 | Qt (you must load it manually as explained on the TopMenu wiki).
Other Linux distributions: see the instructions @ TopMenu wiki.
2. Once TopMenu has been installed, log out and log back in - this is required to load the TopMenu modules.
3. Adding the TopMenu applet to the MATE 1.8 panel.
Before adding the TopMenu applet to the MATE panel, it's important to mention that the default MATE "Menu Bar" will stop working so instead of this applet, you'll have to use either the "Main Menu" applet or the "MATE Menu" applet. If you have the Menu Bar applet added to the panel, remove it before proceeding!
To add TopMenu to the MATE panel, right click the panel in an empty area and select "Add to panel" and add "TopMenu Panel Applet":
Then, open some application that has a menu (try it with a GTK2 app firstly, like Caja), move the menu to the position you want it to be displayed, right click it and select "Lock to panel". If you don't do this, the TopMenu applet position will reset after a logout.
Update: if you use Xfce, see: Use A Global Menu In Xubuntu Or Linux Mint Xfce Via A New TopMenu Plugin [PPA]