arlo@arliri:~/Desktop/programs$ apt-cache policy libqt5multimedia5 libqt5multimedia5: Installed: (none) Candidate: 5.7.1~20161021-2 Version table: 5.7.1~20161021-2 500 500 http://repo.puri.sm/pureos green/main amd64 Packages arlo@arliri:~/Desktop/programs$ sudo apt-get install libqt5multimedia5 Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: libqt5multimedia5 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 285 kB of archives. After this operation, 1,274 kB of additional disk space will be used. Err:1 http://repo.puri.sm/pureos green/main amd64 libqt5multimedia5 amd64 5.7.1~20161021-2 404 Not Found E: Failed to fetch http://repo.puri.sm/pureos/pool/main/q/qtmultimedia-opensource-src/libqt5multimedia5_5.7.1~20161021-2_amd64.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
As you can see at https://repo.puri.sm/pureos/pool/main/q/qtmultimedia-opensource-src/, version 5.9.1 is available instead of 5.7.1 but even after running
apt-get update it does not seem to know this.