As the following link by Vidyo suggests,
https://support.vidyocloud.com/hc/en-us/articles/226103528-VidyoDesktop-3-6-3-for-Linux-and-Ubuntu-15-04-and-higher
one just needs to eliminate dependency on libqt4-gui (again, this case is already mentioned in previous answers but this is yet another approach.)
If I may, let me copy the solution from the above link and paste it here.
I just made changes in the 3rd and 4th steps where I mention using vim editor instead of nano.
1) Download the VidyoDesktop .deb file to your home directory
2) Run the following commands from the terminal (replacing "vidyodesktop.deb" with the exact filename according to your system type)
$ cd ~
$ dpkg-deb -x vidyodesktop.deb vidyobuild
$ dpkg-deb --control vidyodesktop.deb vidyobuild/DEBIAN
3) Edit the package control file
$ vim vidyobuild/DEBIAN/control
Replace the entire Depends: line by copying and pasting the following:
Depends: libxss1,libaudio2,libasound2,libqt4-network
This removes the libqt4-gui transitional package dependency which is no longer required for recent Ubuntu versions
4) Save the customized .deb file
esc
:wq
enter
$ dpkg-deb -b vidyobuild vidyodesktop-custom.deb
5) Install the new VidyoDesktop .deb file by running
$ sudo dpkg -i vidyodesktop-custom.deb
[EDIT: Vidyo desktop works only in wifi mode. If the LAN cable is connected, then Vidyo shuts down. I haven't found a solution to this problem yet. But rest is working!]
Best Answer
Use the Language Support in System Settings:
Click on the 'Install/Remove Languages' button:
Click the checkbox next to the language of your choice and click 'Apply'.