Linux Kernel 4.7 is released – Install it in CentOS 7 and Ubuntu 16.04

After two months of continues development, Linux Kernel 4.7 final version is made available for download for all GNU/Linux operating systems. Yesterday, July 24, 2016, Linux Torvalds wrote in the release notes,

So, after a slight delay due to my travels, I'm back, and 4.7 is out.

Also, he mentioned in the release notes that the development for the next version 4.8 has already been opened.

For more details, check the release notes.

• Linux Kernel 4.7 release notes

In this brief tutorial, We will see how to install Linux Kernel 4.7 version in CentOS 7 and Ubuntu 16.04 LTS.

Install Linux Kernel 4.7 in CentOS 7

I Have successfully installed and tested Kernel 4.7 on CentOS 7 64 bit edition. Although, It might work on other RPM versions such as RHEL 7, Scientific Linux 7 and Fedora etc.

To install the latest kernel, we need to add ELRepo repository.

First, add ELRepo GPG key:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

Then, add ELRepo in CentOS 7 / RHEL 7 / Scientific Linux 7 using command:

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

To Install ELRepo for CentOS 6 / RHEL 6 / Scientific Linux 6:

rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

rpm -Uvh http://www.elrepo.org/elrepo-release-5-5.el5.elrepo.noarch.rpm

Enable ELRepo fastest mirror using by installing the following package:

yum install yum-plugin-fastestmirror

Sample output:

================================================================================
 Package Arch Version Repository
 Size
================================================================================
Updating:
 yum-plugin-fastestmirror noarch 1.1.31-34.el7 base 30 k

Transaction Summary
================================================================================
Upgrade 1 Package

Total download size: 30 k
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm | 30 kB 00:00 
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
 Updating : yum-plugin-fastestmirror-1.1.31-34.el7.noarch 1/2 
 Cleanup : yum-plugin-fastestmirror-1.1.31-25.el7_0.noarch 2/2 
 Verifying : yum-plugin-fastestmirror-1.1.31-34.el7.noarch 1/2 
 Verifying : yum-plugin-fastestmirror-1.1.31-25.el7_0.noarch 2/2

Updated:
 yum-plugin-fastestmirror.noarch 0:1.1.31-34.el7

Complete!

We have added the ELRepo. Now, it is time to install Linux kernel 4.7.

Let us find out the current version details with command:

uname -r

Sample output:

3.10.0-327.22.2.el7.x86_64

As you see, the installed version is 3.10.0-327.22.2.el7.x86_64.

Now, Install Linux Kernel 4.7 using command:

yum --enablerepo=elrepo-kernel install kernel-ml

Note: Since this kernel is just released few hours ago, the latest kernel version is not pushed in the ELRepo yet. It stills shows the 4.5.x version. Hope the latest kernel will be pushed to the repository as soon as possible.

Sample output:

Loaded plugins: fastestmirror
elrepo-kernel | 2.9 kB 00:00 
elrepo-kernel/primary_db | 1.6 MB 00:09 
Loading mirror speeds from cached hostfile
 * base: centos.excellmedia.net
 * elrepo: elrepo.org
 * elrepo-kernel: elrepo.org
 * epel: mirror.rise.ph
 * extras: centos.excellmedia.net
 * updates: centos.excellmedia.net
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:4.7.0-1.el7.elrepo will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=======================================================================================================================================
 Package Arch Version Repository Size
=======================================================================================================================================
Installing:
 kernel-ml x86_64 4.7.0-1.el7.elrepo elrepo-kernel 39 M

Transaction Summary
=======================================================================================================================================
Install 1 Package

Total download size: 39 M
Installed size: 175 M
Is this ok [y/d/N]: n
Exiting on user command
Your transaction was saved, rerun it with:
 yum load-transaction /tmp/yum_save_tx.2016-07-25.16-04.bhKKxr.yumtx
[root@server1 ~]# clear
[3;J
[root@server1 ~]# yum --enablerepo=elrepo-kernel install kernel-ml
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.excellmedia.net
 * elrepo: elrepo.org
 * elrepo-kernel: elrepo.org
 * epel: mirror.rise.ph
 * extras: centos.excellmedia.net
 * updates: centos.excellmedia.net
Resolving Dependencies
--> Running transaction check
---> Package kernel-ml.x86_64 0:4.7.0-1.el7.elrepo will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=======================================================================================================================================
 Package Arch Version Repository Size
=======================================================================================================================================
Installing:
 kernel-ml x86_64 4.7.0-1.el7.elrepo elrepo-kernel 39 M

Transaction Summary
=======================================================================================================================================
Install 1 Package

Total download size: 39 M
Installed size: 175 M
Is this ok [y/d/N]: y
Downloading packages:
kernel-ml-4.7.0-1.el7.elrepo.x86_64.rpm | 39 MB 00:03:12 
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
 Installing : kernel-ml-4.7.0-1.el7.elrepo.x86_64 1/1 
 Verifying : kernel-ml-4.7.0-1.el7.elrepo.x86_64 1/1 

Installed:
 kernel-ml.x86_64 0:4.7.0-1.el7.elrepo 

Complete!

After installing the Kernel, Reboot your system and select the latest Kernel from the Grub boot menu.

Check the Kernel version using command:

uname -r

Sample output:

4.7.0-1.el7.elrepo.x86_64

Congratulation! Your CentOS 7 system is currently running on Kernel 4.7.

Have any problems after installing the new Linux Kernel? No worries, reboot your system. Select your previously working Kernel from the Boot menu.

Then, remove the newly installed Kernel using command:

yum remove kernel-ml

That’s it.

Install Linux Kernel 4.7 LTS in Ubuntu 16.04 LTS

I tested this guide in Ubuntu 16.04 LTS server. However, this guide should work on older Ubuntu versions, Debian, and Linux Mint etc.

Check the current Linux kernel version with command:

uname -r

Sample output:

4.4.0-22-generic

As you see, my Ubuntu 16.04 system has 4.4.0-22-generic kernel version.

Now, we will install Linux Kernel 4.7. You can download the latest kernel from the following link.

• Download Linux Kernel 4.7

For 64 bit Ubuntu systems:

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-headers-4.7.0-040700_4.7.0-040700.201608021801_all.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-headers-4.7.0-040700-generic_4.7.0-040700.201608021801_amd64.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-image-4.7.0-040700-generic_4.7.0-040700.201608021801_amd64.deb

For 32 bit Ubuntu systems:

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-headers-4.7.0-040700_4.7.0-040700.201608021801_all.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-headers-4.7.0-040700-generic_4.7.0-040700.201608021801_i386.deb

wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7/linux-image-4.7.0-040700-generic_4.7.0-040700.201608021801_i386.deb

Then install Kernel 4.7 using command:

sudo dpkg -i *.deb

Finally, update the Grub boot loader with command:

sudo update-grub

Sample output:

Selecting previously unselected package linux-headers-4.7.0-040700.
(Reading database ... 91554 files and directories currently installed.)
Preparing to unpack linux-headers-4.7.0-040700_4.7.0-040700.201607241632_all.deb ...
Unpacking linux-headers-4.7.0-040700 (4.7.0-040700.201607241632) ...
Selecting previously unselected package linux-headers-4.7.0-040700-generic.
Preparing to unpack linux-headers-4.7.0-040700-generic_4.7.0-040700.201607241632_amd64.deb ...
Unpacking linux-headers-4.7.0-040700-generic (4.7.0-040700.201607241632) ...
Selecting previously unselected package linux-image-4.7.0-040700-generic.
Preparing to unpack linux-image-4.7.0-040700-generic_4.7.0-040700.201607241632_amd64.deb ...
Done.
Unpacking linux-image-4.7.0-040700-generic (4.7.0-040700.201607241632) ...
Setting up linux-headers-4.7.0-040700 (4.7.0-040700.201607241632) ...
Setting up linux-headers-4.7.0-040700-generic (4.7.0-040700.201607241632) ...
Setting up linux-image-4.7.0-040700-generic (4.7.0-040700.201607241632) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.7.0-040700-generic /boot/vmlinuz-4.7.0-040700-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.7.0-040700-generic /boot/vmlinuz-4.7.0-040700-generic
update-initramfs: Generating /boot/initrd.img-4.7.0-040700-generic
W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.7.0-040700-generic /boot/vmlinuz-4.7.0-040700-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.7.0-040700-generic /boot/vmlinuz-4.7.0-040700-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.7.0-040700-generic /boot/vmlinuz-4.7.0-040700-generic
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.7.0-040700-generic
Found initrd image: /boot/initrd.img-4.7.0-040700-generic
Found linux image: /boot/vmlinuz-4.4.0-22-generic
Found initrd image: /boot/initrd.img-4.4.0-22-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
done

If you’re using BURG boot loader, then run:

sudo update-burg

Reboot your system and log in to the newly installed Kernel.

Check if new Kernel has been installed with command:

uname -r

Sample output:

4.7.0-040700-generic

If you have any problems after upgrading the Kernel, force reboot your system, and login to the old Kernel by selecting the ‘Advanced options for Ubuntu’ from the Boot menu.

Select the old Kernel which is working without any issues.

Then uninstall the new Kernel with command:

sudo apt-get remove linux-headers-4.7* linux-image-4.7*

Finally, reboot your system once again to log in to the old Kernel.

Additional Tip: If you encountered with an Error in Oracle VirtualBox like below after upgrading to Kernel 4.x version, refer the following link.

I got this error after upgrading the Kernel version.

Kernel driver not installed (rc=-1908)

If you encountered with similar error, refer the following guide to fix the problem.

• VirtualBox error after installing Linux Kernel 4.x in Ubuntu

Want to install Linux Kernel 4.7 in openSUSE? Refer the following link.

• Install Linux Kernel 4.7 in openSUSE

That’s all for now.

If you find this tutorial useful, please share it on your social networks and support OSTechNix.

Thanks for reading! Cheers!!