Just to comment on those words "to re-boot by power button".
Emergency rebooting simply by cutting the power off is not a healthy way.
If you have ext4 file system, it may also cause data loss.
Please try to reboot by pressing keys (one at a time):
R E I S U B
while holding down alt + PrtScn (SysRq)

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Boots normally, but then freezes, before should change to desktop. Must be 
re-booted in order to get to desktop.
https://bugs.launchpad.net/bugs/448241
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