On May 2021, our APT repository has been suspended because it was hosted on Bintray which is no longer available.
All packages are now available on Github Releases page only.
https://github.com/multipath-tcp/mptcp/releases
Please download all .deb packages for one specific release and install them manually, e.g.:
sudo dpkg -i linux*.deb sudo apt-get install -f
Feel free to click on the "Watch" button the repository to get notifications when new versions are available.
Note: only x86_64 packages are available.