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Preparing to unpack .../postfix_3.1.0-3_amd64.deb ... * Stopping Postfix Mail Transport Agent postfix  postmulti: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postmulti: fatal: unable to use my own hostname [ OK ] Unable to update the static FcBlanks: 0x0600 Unable to update the static FcBlanks: 0x0601 Unable to update the static FcBlanks: 0x0602 Unable to update the static FcBlanks: 0x0603 Unable to update the static FcBlanks: 0x06dd Unable to update the static FcBlanks: 0x070f Unable to update the static FcBlanks: 0x2028 Unable to update the static FcBlanks: 0x2029 Unable to update the static FcBlanks: 0xfff9 Unable to update the static FcBlanks: 0xfffa Unable to update the static FcBlanks: 0xfffb GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory This likely means that your installation is broken. Try running the command gdk-pixbuf-query-loaders > /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache to make things work again for the time being. at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148. postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname Use of uninitialized value $destinations in scalar chomp at /var/lib/dpkg/tmp.ci/config line 221. Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121. postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname Use of uninitialized value $mynetworks in scalar chomp at /var/lib/dpkg/tmp.ci/config line 285. Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121. postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname Use of uninitialized value $protos in scalar chomp at /var/lib/dpkg/tmp.ci/config line 387. Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/Client/ConfModule.pm line 121. postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname postconf: warning: valid_hostname: invalid character 10(decimal): sebastian-VIO?sebastian-vio.rainworks.local postconf: fatal: unable to use my own hostname dpkg: error processing archive /var/cache/apt/archives/postfix_3.1.0-3_amd64.deb (--unpack): subprocess new pre-installation script returned error exit status 1