Texmaker Shortcuts not working on Ubuntu 16.04

Even the simple ctrl+F is not working... I tried installing texmaker from software center and xm1math web site, but shortcuts still doesn't work...

Install the Qt5 version of texmaker (at this date it is the one you get from ubuntu-software-center) and always run it from terminal using:

env UBUNTU_MENUPROXY= texmaker

or (a permanent solution)

Edit texmaker:

Open nautilus as root:

sudo nautilus

Navigate to usr/share/applications/texmaker , right click on it, properties, and change on Command texmaker %F by env UBUNTU_MENUPROXY= texmaker %F `

You don't have to install the older version, you just need to remove the appmenu package for QT5:

sudo apt remove appmenu-qt5

P.S. I am not sure if it can cause problems for other applications on your system. It didn't cause any problem in my end.

Regarding solution 2 of Vitor, you can also edit the launcher shortcut to TexMaker:

/usr/share/applications/texmaker.desktop

and change the line

Exec=texmaker %F

to

Exec=env UBUNTU_MENUPROXY= texmaker %F