Sorry for posting many times. As I was able to roll back to original
15.04 as
https://wiki.ubuntu.com/Kernel/MainlineBuilds?action=show&redirect=KernelMainlineBuilds#Uninstalling_upstream_kernels
instructs. Let me add one comment here that Virtualbox didn't come back
again with the following error:
Kernel driver not installed (rc=-1908)
The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is
a permission problem with /dev/vboxdrv.
Please reinstall the kernel module by executing
'/etc/init.d/vboxdrv setup'
as root...
So that I needed to uninstall all of virtualbox packages and install
them again. Then, Virtualbox works again.
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https://bugs.launchpad.net/bugs/1466889
Title:
SD card is not recognized.
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