I im trying to do

sudo apt-get update

but i get the following error:

W: Failed to fetch http://ftp.udc.es/ubuntu/dists/trusty/Release  Unable to find   expected entry 'main/binary-x8-64/Packages' in Release file (Wrong sources.list entry or malformed file)

I have tried resetting the /etc/apt/sources.list like is here suggested:

How do I restore the default repositories?

And also tried to select another server from which to download the updates: 'sudo apt-get update' error on Ubuntu 12.04

But I keep getting the same damned error message. Any ideas?

As asked in comment, doing:

$ grep -R ftp.udc.es /etc/apt/sources.list*

/etc/apt/sources.list:deb http://ftp.udc.es/ubuntu/ trusty main universe

/etc/apt/sources.list.save:deb http://ftp.udc.es/ubuntu/ trusty main



$ cat sources.list

## See sources.list(5) for more information, especialy

# Remember that you can only use http, ftp or file URIs

deb http://ftp.udc.es/ubuntu/ trusty main universe

# CDROMs are managed through the apt-cdrom tool.



$ dpkg --print-architecture 

amd64

$ dpkg --print-foreign-architectures

i386 

x8664

x8-64

x864