Ubuntu 15.10 not start after update. Today i update my ubuntu 15.10 around 11 AM (IST) after update it prompt msg for reboot. After rebooting ubuntu unable to start. Then i revert to previous snapshot it works. But again after software update it unable to start.
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Nice to know at which time you updated your system, but can you provide some error messages too? ;-) – sinclair Feb 23 '16 at 09:14
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i updated my system around 11 am (Indian standard time). After that it prompt window "restart now or restart later" After restarting blank screen only, so cannt say error message. – Raman Das Feb 23 '16 at 09:22
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Confirm. Same problem, same symptoms – Serge Feb 23 '16 at 11:58
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Same here. Had to boot from 4.2.0.27 as @user44849 notes. – ssarabando Feb 23 '16 at 12:00
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I have the same problem except that I am working on VMWare !! – McLan Feb 23 '16 at 14:14
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Here is the description https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1548587/comments/18
Reboot your PC, hold shift while boot load and select previous kernel. Last kernel seems broken

Serge
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The same happens to me. Today updated the kernel to version 4.2.0.30 and Ubuntu freezes after grub. If I try no start from the upstart option I get this message: "Upstart: broken pipe". And if I start from the recovery and repair packages still freezes.
At this moment, the only thing that I can do is to start from the previous kernel 4.2.0.27.
Thanks and best regards.

user44849
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I have the same problem except that I am working on VMWare !!. How can I resolve this – McLan Feb 23 '16 at 14:15