I was trying to get my Logitech G510 keyboard's back-lights working so I went into the Synaptic Package Manager and marked LibG15, G15daemon, and all the other associated packages. Synaptic reported a failed install. Now all Package management is failing due to libg15 being "halfway installed."
Some commands I have tried to fix the problem follow. . .

root@bt:~# apt-get upgrade Reading package lists... Done Building dependency tree
Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it.

root@bt:~# sudo apt-get autoremove Reading package lists... Done Building dependency tree
Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it.

root@bt:~# sudo apt-get -f purge libg15 Reading package lists... Done Building dependency tree
Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it.

root@bt:~# sudo dpkg --configure -a dpkg: dependency problems prevent configuration of g15macro: g15macro depends on g15daemon; however: Package g15daemon is not configured yet. dpkg: error processing g15macro (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of g15stats: g15stats depends on g15daemon; however: Package g15daemon is not configured yet. dpkg: error processing g15stats (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: g15macro g15stats

I'm not too computer savvy. Any help would be much appreciated!!! Note: I'm using Ubuntu 10.04 under Backtrack 5 R3.