I got the same issue with my Dell Inspiron 5155, everytime it went to
sleep I can't boot the laptop.
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https://bugs.launchpad.net/bugs/1909005
Title:
Ubuntu does not resume (wake up) fro
*** This bug is a duplicate of bug 896582 ***
https://bugs.launchpad.net/bugs/896582
I can confirme this bug too.
I found a work around when I was on Kubuntu 12.04 64bits :
http://davidcortijo.wordpress.com/2012/05/07/ubuntu-12-04-how-to-solve-the-wifi-interface-using-ralink-rt3090-card/