when I clicked on Synaptic Package Manager from Administrator dropdown
It is showing error like
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.
E: _cache->open() failed, please report.
When i typed in the terminal
dpkg --configure -a
It is telling
dpkg: unknown option --configure-a
Type dpkg --help for help about installing and deinstalling packages[*];
Use `dselect' or `aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --license for copyright license and lack of warranty (GNU GPL)[*].
Options marked[*] produce a lot of output - pipe it through `less' or `more' !
I am not getting head and tail of it...Please help me...