The new Ubuntu kernel cannot be rolled back to the old kernel.

First, let's take a look at the kernel files on your computer.

[email protected]:~$ dpkg --get-selections|grep linuxlibselinux1:i386                installlinux-firmware                    installlinux-headers-3.13.0-24                installlinux-headers-3.13.0-24-generic            installlinux-headers-3.13.0-32                installlinux-headers-3.13.0-32-generic            installlinux-headers-3.13.0-35                installlinux-headers-3.13.0-35-generic            installlinux-headers-3.13.0-36                installlinux-image-3.13.0-24-generic            installlinux-image-3.13.0-32-generic            installlinux-image-3.13.0-35-generic            installlinux-image-3.13.0-36-generic            deinstalllinux-image-extra-3.13.0-24-generic        installlinux-image-extra-3.13.0-32-generic        installlinux-image-extra-3.13.0-35-generic        installlinux-image-extra-3.13.0-36-generic        deinstalllinux-libc-dev:i386                installlinux-sound-base                installpptp-linux                    installqtcreator-plugin-remotelinux:i386        installsyslinux                    installsyslinux-common                    installsyslinux-legacy                    installutil-linux                    install[email protected]:~$ 

Then delete the latest kernel, Which is 36:

[email protected]:~$ sudo apt-get remove linux-headers-3.13.0-36-generic linux-image-3.13.0-36-generic linux-image-extra-3.13.0-36-generic 

In this way, the old 35 kernel will be started next time.

Many problems are solved.

The new Ubuntu kernel cannot be rolled back to the old kernel.