The thing is that I have GoogleTalk plugin, also used for Google+ hangouts, and it works in my netbook, on Ubuntu. But on my laptop, using the same Ubuntu (Oneric) and having used the camera on Cheese so it works, Google+ shows a black screen while trying to use webcam in hangouts.
This is weird, I have installed libv4l-0 and forced GoogleTalkPlugin to preload it. Starting from a console, it shows:
[009:591] Got cookie response, socket is authorized [009:591] AUTHORIZED; socket handshake complete [014:536] HandleOnlineCheck: Starting check [014:536] HandleOnlineCheck: OK; current state: 3 [031:321] Error(scriptinterface.cc:288): Passed a non-object for onmessasge_callback Check failed: g_shutdown_pipe_write_fd != -1 [113:230] Warning(clientchannel.cc:678): Connection to GoogleTalkPlugin lost, reason=0 [113:367] Error(scriptinterface.cc:288): Passed a non-object for onmessasge_callback
I just don't know why I cannot get it to work. My netbook (hp-mini) works fine with an integrated camera.