This is exactly what it says: dpkg: error processing /var/cahce/apt/archives/libsdl-ttf2.0_2.0.9-1osso0+0m5_armel.deb (--unpack) : trying to overwrite '/usr/lib/libSDL_ttf-2.0.so.0.6.3'. which is also in package libsdl-ttf2.0-0 Errors were encountered while processing: '/var/cahce/apt/archives/libsdl-ttf2.0_2.0.9-1osso0+0m5_armel.deb E: Sub-process /usr/bin/dpkg returned an error code (1) It says that even after the apt clean command.