Running KDE Plasma 5.24.6 on Kernel 5.18.14-1-MANJARO.
I tried updating/ upgrading using sudo pacman -Syyu. But it results in non-resolved conflicts and fails.
Upgrade through Pamac also failed.
How do I get the update through?
Hi @deshmukh,
That kernel is long EOL. It should have been removed a long time ago.
Similarly with this. The current one is 6.3.2.
To be totally honest, this is so far behind current that I think a complete backup and reinstall would be better and easier.
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Post the output of what failed and how and why - post the output of the command you used to (try to) update.
If it does involve any notion of the community repo - look at the “latest” posts here.
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What I’d suggest:
chroot into the system (preferably using a current .ISO)Âą:
manjaro-chroot -a
Edit /etc/pacman.conf — I recommend nano for this — and remove [community] and the Include = line below it (SigLevel = too, if it’s there); save and exit;
Install a current LTS Kernel e.g.:
pacman -S linux612
Remove the old one:
pacman -R linux518
Try running the upgrade. If it appears to go through (with any needed manual intervention during the process), exit chroot, reboot and keep fingers crossed. 
1 Ventoy is a good option here; see [HowTo] Create a Ventoy USB to launch Manjaro (and other) ISO's - #2
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I would agree. It is probably going to take far less time and energy to reinstall from a recent ISO than to try and salvage an unmaintained system.
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Manually - by reading the output …
Login into TTY and disable the display-manager - gdm, sddm, lightdm
sudo systemctl disable --now <display-manager>
Then update the system - if you run into conflicts resolve them - remove offending packages.
When your system boots to console (TTY) without issues - next step is the desktop part
The hardest part is the desktop part - especially for plasma - it usually requires removing all kde plasma related configuration files.,
To test if your display-manager can load
sudo systemctl start <display-manager>
If it loads - try logging in - if that succeed - reenable your display manager
sudo systemctl enable <display-manager>
A very long time ago - I took a Manjaro 0.8 ISO and updated it - and I took notes, feel free to use them as a reference for ideas on how to progress.
Do note this was written in 2019 - much has changed since - the hard work concept is still valid though - you must adapt to present day.
→ update-old-manjaro-installation
Perhaps you will find it easier to copy data from /home/$USER folder and wipe everything using the most recent install ISO.
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Disabling it would be a bad idea, because that’ll prevent it from coming up again at the next boot.
Stopping it would be better. 
sudo systemctl stop <name-of-display-manager>
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And that is precisely the point - until you are sure the graphic environment is updated correct - keeping the display manager disabled - makes it easier to get to a working console.
I added a couple of lines explaining the further steps.