That is probably because the sources.list file is malformed, can you please post the contents of that file cat /etc/apt/sources.list or gedit /etc/apt/sources.list Copy and paste the file or upload it as an attachment.
That is probably because the sources.list file is malformed, can you please post the contents of that file sources. list sources. list
cat /etc/apt/
or
gedit /etc/apt/
Copy and paste the file or upload it as an attachment.