update on ubuntu 14.04 "E: Some index files failed to download. They have been ignored, or old ones used instead."

I called sudo apt-get update, i got something like this

Err http: //ppa.launchpad.net trusty/main i386 Packages
  404  Not Found

this

Err http: //ppa.launchpad.net trusty/main i386 Packages
  404  Not Found

and this is what the last line look like

W: Failed to fetch http: //ppa.launchpad.net/marlin-devs/marlin-daily/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Failed to fetch http: //ppa.launchpad.net/tiheum/equinox/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

SO, anyone can help me?? FYI, this is from Ubuntu 14.04

The below line is not a valid PPA line, so delete it or put # symbol before it in /etc/apt/sources.list file (you can edit it with sudo -H gedit /etc/apt/sources.list):

deb http: //ppa.launchpad.net trusty/main i386 Packages

And also remove the Not found PPA's:

sudo add-apt-repository -r ppa:marlin-devs/marlin-daily
sudo add-apt-repository -r ppa:tiheum/equinox

Now run the sudo apt-get update command.