This repository is no longer maintained. Packages of the Nextcloud desktop client are now available in stretch-backports and buster.
If you used this repository before, please do the following.
Quit the Nextcloud client.
Remove the old package and repository:
sudo apt remove --purge nextcloud-client && sudo apt autoremove --purge
sudo rm /etc/apt/sources.list.d/nextcloud-client-m4lvin.list
sudo apt-key del 749224A4AF352B44511E050E7E420D98B2CF44CE
sudo apt update
Then you can install the new package from
stretch-backports as follows:
Ensure you have
deb https://deb.debian.org/debian stretch-backports main in your
sudo apt update && sudo apt install -t stretch-backports nextcloud-desktop
If you want dolphin integration, also do
sudo apt install -t stretch-backports dolphin-nextcloud.
Alternatively, you can use the AppImage from nextcloud.com.