Modern distros have matured quite a bit even though there are occasionally some major subsystem changes being made. Yet it's never been easier to do an in-place major version upgrade.
I just did the upgrade on several Mageia6 systems and the results were consistent and satisfactory, not to mention simple.
Step 0.Always backup critical information. Have a Mageia7 recovery disc on hand. You can download the ISO image from here.
Read the Release Notes, the Documentation and the Errata for Mageia 7. Other than updated applications, the biggest changes are support for UEFI and the move to GRUB2. If you are upgrading from a GRUB/Mageia5, you will keep GRUB.
You can always download an ISO image to do the upgrade rather than do an in-place installation if your Internet connection is slow. Simply choose the Upgrade option rather than the Install option.DO NOT attempt an upgrade from the Live ISO image as it will overwrite your existing system.
Upgrade the MGA Applet
Step 1. Open a terminal window.
$ sudo mgaapplet-upgrade-helper --new_distro_version=7
And you're done. This essentially does all the following individual commands.
Upgrade Using URPMI
Step 1. Fully update the packages you now have installed.
$ sudo urpmi --auto-update --auto -v
Step 2. Remove all the existing Mageia6 repositories.
$ sudo urpmi.removemedia -av
Step 3. Add the Mageia 7 repositories. (All on one line.)
$ sudo urpmi.addmedia --distrib --mirrorlist 'http://mirrors.mageia.org/api/mageia.7.x86_64.list'
Note: for 32-bit systems, substitute i586 for x86_64.
Step 4. Update the packages.
$ sudo urpmi --replacefiles --auto-update --auto -v
Step 5. Reboot. You'll be using a new kernel, new glibc and so on.
$ sudo shutdown -r now
Step 6. Run the package update command from Step 4 again. It should return with no packages needing updating.
Upgrade Using DNF
Step 1. Update your current installation$ sudo dnf upgrade
Step 2. Install the dnf system-upgrade plugin$ sudo dnf install 'dnf-command(system-upgrade)'
Step 3. Run the system-upgrade download phase.$ sudo dnf system-upgrade --releasever 7 download --allowerasing
Step 4. Start the upgrade.$sudo dnf system-upgrade reboot
All Done. But . . . . Do Some Checking.
$ cat /etc/redhat-release
$ cat /etc/issue
Those commands should return the information that you are running Mageia release 7 (Official) and Kernel 5.1.14-desktop-1.mga7 .
I did have an issue on one machine and running
$ sudo urpmi mageia-release-common
You can also manually edit those version files in /etc to change the version number.
"60% of the Time, It Works Every Time" -- Anchorman