Insync loves Linux

https://www.insynchq.com/linux

Official repositories

APT

Add Insync as a source

1. First, add our public GPG key to allow apt to authenticate the Insync repository:
   

   $ wget -O - https://d2t3ff60b2tol4.cloudfront.net/services@insynchq.com.gpg.key \
     | sudo apt-key add -

2. Edit /etc/apt/sources.list and add deb http://apt.insynchq.com/[DISTRIBUTION] [CODENAME] non-free
   Replace [DISTRIBUTION] with your Linux distro: ubuntu, debian, mint
   Replace [CODENAME] with your Linux distro codename: for example Ubuntu 12.04 is precise
3. Update the apt repository:
   

   $ sudo apt-get update

Generic installer (use this if you're not using GNOME Shell, Cinnamon, or KDE 4) $ sudo apt-get install insync-beta-ubuntu
GNOME Shell $ sudo apt-get install insync-beta-gnome
Cinnamon $ sudo apt-get install insync-beta-cinnamon
KDE 4 $ sudo apt-get install insync-beta-kde
The APT repository officially supports Debian, Mint, and Ubuntu only.
For other Debian-based distributions, try using the one for Debian Squeeze.

Yum

1. First, import the public GPG key used to sign the RPMs. $ sudo rpm --import https://d2t3ff60b2tol4.cloudfront.net/repomd.xml.key
   
2. Create a new file insync.repo in /etc/yum.repos.d/ with the following content.

   [insync]
   name=insync repo
   baseurl=http://yum.insynchq.com/fedora/
   gpgcheck=1
   gpgkey=https://d2t3ff60b2tol4.cloudfront.net/repomd.xml.key
   enabled=1
   repo_gpgcheck=1
   metadata_expire=60m

GNOME Shell $ sudo yum groupinstall insync-beta-gnome
Cinnamon $ sudo yum groupinstall insync-beta-cinnamon
KDE 4 $ sudo yum install insync-beta-kde

Direct download

For GNOME Shell and Cinnamon, Insync is split into two packages.
Install gnome-cinnamon-common and then choose the JavaScript applet that matches your desktop.

Generic installer

64-bit deb, 32-bit deb

GNOME Shell and Cinnamon common

64-bit deb, 32-bit deb
64-bit rpm, 32-bit rpm

KDE 4

64-bit deb, 32-bit deb
64-bit rpm, 32-bit rpm

openSUSE and GNOME Shell

64-bit, 32-bit, GNOME Shell applet

Cinnamon JavaScript applet

deb, rpm

GNOME Shell JavaScript applet

deb, rpm

KDE 4 optional plasmoids (Installing Plasmoids)

insync.plasmoid, gdrive_webview.plasmoid

Others

AUR package for Arch Linux (with thanks to xzy3186)