Same issue as above, Manjaro Hello will not open. Also, Flatpaks will not install using Pamac 10. It simply says “Nothing to do” when I click “Apply”.
I also received the update to Pamac 10.0.0-1 , today 2020-12-19; is no longer able to check updates from AUR packages: the previous release of Pamac, instead, was able, was indicating me that there were some AUR packages to update.
We have downgraded pamac back to 9.5.12, however kept pamac-dev on the higher version. People can still switch to testing to see if there are issues. If there are some, please report, as we developer won’t have time to read the forums.
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Will we get full update before New Year?
So if the packages are downgraded in the repo, should I downgrade what I already upgraded, or wait to see if their are new 10 packages in the near future?
Also for KDE users (if they upgraded before the downgrade) , as discussed in the pamac forum section the tray indicator gets a replacement called pamac-tray-icon plasma, and you can remove the other one.
I simply checked “Enable downgrade” in Pamac’s preferences under the “Advanced” tab, refreshed my databases, and let Pamac take care of itself after that. So now I’m back on Pamac 9 until they get 10 ready again. I’m actually really thankful for the downgrade feature for this very reason, and I’m a little embarrassed I ignored it for so long. 
Also Pamac 10 can not install packages with optional dependency it is crashing always, e.g. libreoffice-fresh
@MartinLocheed Thank you very much !!
I got problem in my Manjaro Gnome Stable after yesterday pacman update 9.5.12-1 → 10.0.0-1. Manjaro Hello did not open or react in any way except uninstall/re-install. Perhaps something else did not work properly, I don’t know.
I made pacman downgrade (from 10 back to 9) as you advised and now Manjaro Hello works again OK. 
Question: Is it safe to keep pacman setting ‘Enable downgrade’ in force after this or should I disable it ?? Does this setting downgrade something else besides (or in addition to) pacman ?
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It is safe to keep it enabled. I usually recommend enabling that as part of the initial manjaro install for my users. Usually if a package version is lower in the repos than it is on your computer, there’s a reason, and you are generally advised to keep the packages on your system in sync with those in the repos.
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as doing downgrade, pamac have disappeared from repos and only -dev version have remained
pacman -Ss pamac
extra/pamac-cli-dev 10.0.0-1.0
A Package Manager based on libalpm with AUR and Appstream support
extra/pamac-common-dev 10.0.0-1.0
A Package Manager based on libalpm with AUR and Appstream support
extra/pamac-flatpak-plugin-dev 10.0.0-1.0
Flatpak plugin for Pamac
extra/pamac-gnome-integration-dev 10.0.0-1.0
Pamac gnome integration
extra/pamac-gtk-dev 10.0.0-1.0
A Package Manager based on libalpm with AUR and Appstream support
extra/pamac-qt 0.3.2-2
A Qt5 frontend for libalpm - prerelease version
extra/pamac-snap-plugin-dev 10.0.0-1.0
Snap plugin for Pamac
extra/pamac-tray-icon-plasma 0.1.2-2
Pamac tray icon for plasma users
Yeah I just got this from yay
:: Searching AUR for updates...
-> Missing AUR Packages: pamac-common pamac-flatpak-plugin pamac-gtk
-> Flagged Out Of Date AUR Packages: megasync-nopdfium
:: 2 Packages to upgrade.
2 aur/jackett 0.17.103-1 -> 0.17.118-1
1 aur/pamac-cli 9.5.12-1 -> 10.0.0-1
==> Packages to exclude: (eg: "1 2 3", "1-3", "^4" or repo name)
==>
:: Checking for conflicts...
:: Checking for inner conflicts...
->
Package conflicts found:
-> Installing pamac-cli will remove: pamac-gtk (pamac)
-> Conflicting packages will have to be confirmed manually
[Repo Make:1] itstool-1:2.0.6-2
[Aur:2] jackett-0.17.118-1 pamac-cli-10.0.0-1
==> Remove make dependencies after install? [y/N]
Don’t know what’s happening exactly.
2 Likes
Not from the AUR, no.
It looks solid and even launch with flatpak plugin installed. I’ll test it more deeply tomorrow.
Updated Pamac back to 10 today. AUR works, along with Manjaro Hello, but unfortunately flatpak still doesn’t (and I can’t even uninstall flatpak applications, still getting “Nothing to do” messages).
For devs, I posted this here:
All good now. Thank you!
Enabled downgrade and refreshed databases, but doesn’t work. Any hints?
Do not use pamac to downgrade itself. It does not work.
Use this:
sudo pacman -U /var/cache/pacman/pkg/pamac-common-9.5.12-2-x86_64.pkg.tar.zst /var/cache/pacman/pkg/pamac-cli-9.5.12-1-x86_64.pkg.tar.zst /var/cache/pacman/pkg/pamac-gtk-9.5.12-1-x86_64.pkg.tar.zst
Search in /etc/pacman.conf for the commented out IgnorePkg. Uncomment it and add pamac-gtk pamac-common pamac-cli like this:
IgnorePkg = pamac-gtk pamac-common pamac-cli
Somehow pamac-gtk 9.5 still keep showing updates for pamac-cli, pamac-common & pamac-gtk. The “Ignore all”-button does not work. It’s a weird interpretation of pacman.conf’s IgnorePkg TBH.
Question: Is it safe to keep pacman setting ‘Enable downgrade’ in force after this or should I disable it ?? Does this setting downgrade something else besides (or in addition to) pacman ?
It is undesirable when when you upgraded a package from the AUR which bears the same name as the one from the repositories, and the version at manjaro’s repos is still outdated. At least I experienced pamac wants to downgrade them while it obviously shouldn’t.
If you don’t use the AUR at all. I think it won’t hurt that much.