[ubuntu] Package openbox is not available (Ubuntu 14.04)

Hi everybody! I'm trying to download x11 for some school assignments because apparently I don't already have it (ruing Ubuntu 14.04), but when I try " sudo-aptget install xorg openbox ", I get this:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package openbox is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'openbox' has no installation candidate

Any ideas on how to fix this? I also tried " sudo apt-get update ", but I get another error:

W: Failed to fetch http://dl.google.com/linux/chrome/de...stable/Release Unable to find expected entry 'main/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.

Really appreciate any feedback. Thanks!