I tried reinstall tdelibs14-trinity-dev and libtiff4-dev just to find out that neither libtiff4 nor libtiff4-dev is installable. How did I get it on my system? is libtiff5 compatible? thanks and regards apt-get --reinstall install libtiff4-dev tdelibs14-trinity-dev libtiff4:amd64 Reading package lists... Done Building dependency tree Reading state information... Done Reinstallation of libtiff4 is not possible, it cannot be downloaded. Reinstallation of libtiff4-dev is not possible, it cannot be downloaded. 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 8 not upgraded. Need to get 0 B/6,151 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] (Reading database ... 373052 files and directories currently installed.) Preparing to unpack .../tdelibs14-trinity-dev_4%3a14.0.2-0debian8.0.0+0_amd64.deb ... Unpacking tdelibs14-trinity-dev (4:14.0.2-0debian8.0.0+0) over (4:14.0.2-0debian8.0.0+0) ... Processing triggers for man-db (2.7.0.2-5) ... Setting up tdelibs14-trinity-dev (4:14.0.2-0debian8.0.0+0) ... Processing triggers for libc-bin (2.19-18+deb8u1) ...