Ubuntu Update kernel switch kernel boot

1. Review the kernel commands that need to be updated:

Apt-cache Search Linux

The command will show all the kernels that can be obtained

2. Install the kernel, assuming you want to install a kernel of 2.6.39-0, use the following command

sudo apt-get install linux-headers-2.6.39-0-generic linux-image-2.6.39-0-generic

After installation, reboot can, after reboot, both start with the new kernel

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If you want to switch back to the original kernel, for example, 3.2, use the command first

1. grep menuentry /boot/grub/grub.cfg

This command displays the order of the kernel, for example, shown as:

Menuentry ' Ubuntu, with Linux 3.2.17experimental '--class Ubuntu--class gnu-linux--class GNU--class os {menuentry ' Ubun Tu, with Linux 3.2.17experimental (recovery mode) '--class ubuntu--class gnu-linux--class GNU--class os {menuentry ' Ubu NTU, with Linux 3.2.17-chipsee '--class ubuntu--class gnu-linux--class GNU--class os {menuentry ' Ubuntu, with Linux 3.2 .17-chipsee (Recovery mode) '--class ubuntu--class gnu-linux--class GNU--class os {menuentry ' Ubuntu, with Linux 3.2.0- 23-generic '--class ubuntu--class gnu-linux--class GNU--class os {menuentry ' Ubuntu, with Linux 3.2.0-23-generic (Recov ery mode) '--class ubuntu--class gnu-linux--class GNU--class os {menuentry "Memory Test (memtest86+)" {menuentry "Memor Y Test (memtest86+, serial console 115200) "

2. If you want to start with the 3.2.17 kernel version,/etc/default/grub the file in the

Grub_default=0

Switch

grub_default=2 after saving

3. Then use the command sudo update-grub

4.重启后，使用命令uname -a查看，内核即为你想要的内核

Ubuntu Update kernel switch kernel boot