Hello, according this page: https://wiki.debian.org/Teams/Apt/Sha1Removal I wrote about problem with Insync to developers and they fixed it. So I think, Insync can be changed. After this I tried apt-get update and it is without problems.
OS: Debian testing Kernel: 4.4.0-1-amd64 Thank you very much. Best regards, Roman Duriska.
