Create a file /etc/apt/sources.list.d/insync.list with the following content
deb http://apt.insynchq.com/[DISTRIBUTION] [CODENAME] non-free contrib
Replace [DISTRIBUTION] with your Linux distro: ubuntu, debian, mint
Replace [CODENAME] with your Linux distro codename. Here is a list of codenames for ubuntu, debian, and mint For example Ubuntu 12.04 is precise
Here is an example for Ubuntu 17.10:
deb http://apt.insynchq.com/ubuntu artful non-free contrib
(Source packages are not available, only binaries.)
Update the apt repository:
$ sudo apt-get update
$ sudo apt-get install insync
File manager integration will be added when Insync is run.
The APT repository officially supports Debian, Mint, and Ubuntu only.
For other Debian-based distributions, try using the one for Debian Squeeze.
First, import the public GPG key used to sign the RPMs.