problem in config file

[ak331]

I tried to install a package and something happened and I have a message that package need to be installed but when I tried to install it it gives the message as follows

E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.
E: _cache->open() failed, please report.

when I tried to run the command it tells me that I need to be superuser

when I type su in terminal window and prompts me for password and get a message that authentication failed.

need help

[gettinoriginal]

sudo dpkg --configure -a

Also, cache open usually means that you have more than one package manager open at the same time. When trying to install a program, you can only have one package manager open ie: synaptic, terminal, add/remove

[ak331]

resolved