remove psutils libtiff4 libxtst6 libkrb53 synaptic Building the package cache... Initializing package resolver and worker... E: invalid version string '0.78_02-1' W: error while parsing a version for the package 'perl-modules' Scheduling requested actions... Resolving possible unmet dependencies... W: version string 'M17-1': first upstream character 'M' is not a digit W: version string 'M17-1': first upstream character 'M' is not a digit W: some solutions were dropped, you may want to increase the value of the 'cupt::resolver::max-solution-count' option E: unable to resolve dependencies, because of: xserver-xorg 1:7.1.0-19 depends on 'xbase-clients' -> no solutions xbase-clients 4.3.0.dfsg.1-14sarge7 depends on 'libxtst6 | xlibs (>> 4.1.0)' -> removed xbase-clients xlibs 4.3.0.dfsg.1-14sarge7 depends on 'libxtst6' -> removed xlibs xserver-xfree86 1:7.1.0-19 depends on 'xserver-xorg' -> installed xserver-xorg 1:7.1.0-19 x11-common 1:7.1.0-19 conflicts with 'xserver-xfree86 (<< 1:7.0)' -> installed xserver-xfree86 1:7.1.0-19 libxinerama1 1:1.0.1-4.1 depends on 'x11-common' -> installed x11-common 1:7.1.0-19 gnome-keyring 0.6.0-3 depends on 'libxinerama1' -> installed libxinerama1 1:1.0.1-4.1 libgnome-keyring0 0.6.0-3 depends on 'gnome-keyring (= 0.6.0-3)' -> installed gnome-keyring 0.6.0-3 gksu 2.0.0-1 depends on 'libgnome-keyring0 (>= 0.4.3)' -> installed libgnome-keyring0 0.6.0-3 gksu 1.2.5-3 depends on 'libgksuui1.0-0' -> installed gksu 2.0.0-1 libgksuui1.0-0 1.0.4-3 depends on 'xbase-clients' -> removed libgksuui1.0-0 xbase-clients 4.3.0.dfsg.1-14sarge7 depends on 'libxtst6 | xlibs (>> 4.1.0)' -> removed xbase-clients xlibs 4.3.0.dfsg.1-14sarge7 depends on 'libxtst6' -> removed xlibs E: error performing the command 'remove'