you appear do have modified the corlib: Dependencies.txt: libmono-corlib2.0-cil 2.6.7-5ubuntu3 [modified: usr/lib/mono/2.0/mscorlib.dll]
do you recall why you changed it, or which program could ahve changed it?
apt-get install --reinstall libmono-corlib2.0-cil should fix the upgrade issue
you appear do have modified the corlib: corlib2. 0-cil 2.6.7-5ubuntu3 [modified: usr/lib/ mono/2. 0/mscorlib. dll]
Dependencies.txt:
libmono-
do you recall why you changed it, or which program could ahve changed it?
apt-get install --reinstall libmono- corlib2. 0-cil
should fix the upgrade issue