i have tried to search a solution: When i choose to upgrade with upgrading automaticly the differents repository( included ppa:mutlaqja/ppa),
the new toupcam driver and lib do not work. so i go to
launchpad.net/~mutlaqja/+archive/ubuntu/ppa
and download by firefox "libtoupcam_1.0.0~201811141232~ubuntu18.04.1_amd64.deb" and "indi-toupcam_0.1~201811151255~ubuntu18.04.1_amd64.deb" then under Terminal "sudo dpkg -i libtoupcam_1.0.0~201811141232~ubuntu18.04.1_amd64.deb indi-toupcam_0.1~201811151255~ubuntu18.04.1_amd64.deb i have a message of degrading but installation is ok.
After the indi-toupcam is working again.