I am having a lot of luck recently with cheap (€15), low-featured LogiTech webcams like the C250 & E3500 which work literally plug-and-play out-of-the-box under GNU/Linux.
(My Windows-era dead-expensive €99 Creative Live!Cam Voice would not work under GNU/Linux.)
However, after installing LMDE XFCE I was having a problem with Skype not willing to use the webcam microphone nor my rear internal mic.
Running alsamixer or deleting its .conf file would not solve my issue.
Then I learned about this little jewel from the Arch fora...
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sudo apt-get install pavucontrol
It allows one to configure sound channels in a GUI.
I am now very happy to see Skype automatically grab the webcam mic.