aptitude -t lenny-backports install mono-devel

...

The following packages have unmet dependencies:
libmono-system-data-linq2.0-cil: Conflicts: libmono-system-data2.0-cil (< 2.6.7-4) but 2.6.7-4~bpo50+1 is to be installed.
I found this but don't know what it's about. He says:

There is a ~ missing at the end of the versioned conflict, it should do then.
I'm pretty much a linux noob. Can you help?
Momoe Reviewed by Momoe on . mono on debian, install problem I found this but don't know what it's about. He says: I'm pretty much a linux noob. Can you help? Rating: 5