Running apt-get update returns the following: ... Fetched 9,539 kB in 1min 17s (123 kB/s) W: Failed to fetch http://mirror.ppa.trinitydesktop.org/trinity/trinity-r14.0.0/debian/dists/jessie/main/binary-armhf/Packages Hash Sum mismatch W: Failed to fetch http://mirror.ppa.trinitydesktop.org/trinity/trinity-builddeps-r14.0.0/debian/dists/jessie/main/binary-armhf/Packages Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead. The files haven't failed to download and they are the same files I receive when downloading them manually. /var/lib/apt/lists and /var/cache/apt rebuild with the same contents and error. The only thing that seems odd is that the builddeps Package date is 23-Nov-2015.