If the problem is 11cache you might try moving that file temporarily to a different directory (say, /tmp) and then try running synaptic again to see if that solves the problem. If it does, you have your solution. If it doesn't put the file back in case it does something important. I don't have this file in my /etc/apt/apt.conf.d so it is not necessary for all systems (but then I never use synaptic
this is the result of the command plz help me efor formatting
I'm sorry but I don't understand this sentence.