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Sorry for bad English:) Had same issue on my Lenovo laptop (intel hd video card) - had a freeze on restart/shutdown/sleep with Kubuntu 15.04. Same issue was reproduced with Ubuntu 14.04. In my case I even was unable to switch to tty. On my laptop i had no fglrx, tried to modify grub config with all found "solutions" as reboot=bios & etc. - nothing ...


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Okay, ALL FIXED. I hope that anyone with this problem can see it. All I had to do was get a 12 or 14.04 live install, pick the advanced options, then go into the recovery mode. Pick drop into root shell. THEN I ran sudo dpkg --configure -a, then installed Nvidia drivers.


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About a year after I posted this question, and after testing on other linux distros including Kubuntu, I can now confidently say that the Nvidia drivers were not the issue: disabling intel proprietary microcode drivers solves the problem.


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Use this little how-to to have GRUB boot your machine to single user mode (runlevel 1). Then you should be able to access system logs to understand why your server freezes at boot. But please tell me you still have a way to revert machine to 12.04 !


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The cause was indeed a specific add-on. In my case it was an add-on called MEGA which supported downloads from the MEGA cloud drive service. I suspect the reason is the change of the URL.


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After reporting my issue on the Xorg and the Linux kernel Bugzilla, I was invited to test a kernel patch (this is the patch, posted for this bug). After compiling and installing the patched kernel, the problem looks gone, and the dynamic turn on/off of the discrete graphic card is working again. I have to thanks kernel developers for pointing me to the ...


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I had this same issue with Ubuntu 15.04. Solved it by removing psensors with sudo apt-get remove psensors



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