I can't get download manager to work, error message???

[heavy metal]

Tried to upgrade to firefox 3.5 using answer#76445 with the terminal and now I can't get the Update Manager to work, error message:

:Type 'echo' is not known on line 54 in source list /etc/apt/sources.list, E:The list of sources could not be read.'

[Micah Gersten (micahg)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs#When%20not%20to%20file%20a%20bug.