Try
Code:
aptitude search libsnmp15
My output is something like this:
Code:
i libsnmp15 - SNMP (Simple Network Management Protocol) library
p libsnmp15-dbg - SNMP (Simple Network Management Protocol) library debug
Now reinstall these (or in your case some more packages).
Code:
aptitude reinstall libsnmp15
.
.
.
Now you should be able to
Code:
apt-get autoclean && apt-get autoremove && apt-get update && apt-get upgrade
Be cafeful when using autoclean and autoremove cause I don't know what else you did to your system, you might end up removing useful packages. Good luck.