Thank you for your answer. This is the output of lsusb on my ac100-114:
charles@miniLyra:~$ sudo lsusb
[sudo] password for charles:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 0424:2512 Standard Microsystems Corp. USB 2.0 Hub
Bus 002 Device 002: ID 0424:2513 Standard Microsystems Corp.
Bus 001 Device 003: ID 0db0:3822 Micro Star International
charles@miniLyra:~$
I dont notice that a picture was taken by my webcam during installation.
I believe that my webcam was not detected.
However, it exists since it worked under android and under phh's latest.