I am using Ubuntu 14.04 32 bit version. I have installed Skype 188.8.131.52. I can call anyone. But when I try for conference call, my video device does not work and my friends on the call can see that my skype is not upgraded to allow conference call. Can anyone help?
Possibly you hit bug #1372846. Try this:
sudo apt-get install skype-bin
Video conferencing works on Skype for Windows. You can install this on Ubuntu using PlayOnLinux/Wine, but it requires some fiddling...