Comment 9 for bug 111688

Hello I am new to ubuntu,
Thank you for everyone posting their help.
I have this appear when I try to access the synaptic pack manager:

E: Malformed line 10 in source list /etc/apt/sources.list (dist)
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.

Then I tried to do what Arnav Ghosh suggested and in the terminal it says this:

nathan@Passionate:~$ sudo rm -f /var/cache/apt/*.bin
nathan@Passionate:~$ sudo apt-get update
E: Malformed line 10 in source list /etc/apt/sources.list (dist)
nathan@Passionate:~$

I do not know what a source list is, or where to find it could someone help me please?
Thank you so much for your time and patience.