I apologize for a previous post that had to do with this or a similar problem, but I was unable to respond because life got in the way. Fortunately it was resolved for someone else who chimed in with the same issue. 
I havenāt been able to install any packages that required importing keys. Nothing imperative so I did without extra packages. Now Iām having more issues.
First, I canāt update nvidia drivers with new kernel. This lead to working on updating the keyring, because thatās been a mess. I first noticed pacman was having issues when running ābmenuā, āFix Pacmanā was highlighted RED and I ran it a few times. The problem persisted, or it stayed red anyway. Now I have looked for solutions and came to here: https://wiki.manjaro.org/index.php/Pacman_troubleshooting
successfully updated manjaro-keyring, but archlinux-keyring-*-any.pkg.tar.xz does not exist, at least not at that address.
I went back to trying to resolve the problem of installing my nvidia drivers. I found a solution here: https://forum.manjaro.org/t/unable-to-satisfy-dependency-nvidia-driver-install/22864
I get all the way to removing cuda to prepare for installing my nvidia-x-x-prime (i am on a hybrid/alienware laptop) and then follow up with:
sudo mhwd -f -i pci video-hybrid-intel-nvidia-450xx-prime
and get:
**> Installing video-hybrid-intel-nvidia-450xx-prime...**
Using default
Has lib32 support: true
Sourcing /var/lib/mhwd/db/pci/graphic_drivers/hybrid-intel-nvidia-450xx-prime/MHWDCONFIG
Processing classid: 0300
Sourcing /var/lib/mhwd/scripts/include/0300
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
multilib is up to date
resolving dependencies...
looking for conflicting packages...
Packages (4) lib32-nvidia-450xx-utils-450.66-1 linux58-nvidia-450xx-450.66-15 nvidia-450xx-utils-450.66-1 nvidia-prime-1.0-4
Total Installed Size: 367.82 MiB
:: Proceed with installation? [Y/n]
checking keyring...
downloading required keys...
:: Import PGP key CAA6A59611C7F07E, "Philip Mueller <philm@manjaro.org>"? [Y/n] error: key "CAA6A59611C7F07E" could not be looked up remotely
y:: Import PGP key 428F7ECC7117F726, "Helmut Stult <helmut@manjaro.org>"? [Y/n] error: key "428F7ECC7117F726" could not be looked up remotely
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.
Error: pacman failed!
**Error: script failed!**
Seemed to have found solution here: https://www.cupoflinux.com/SBB/index.php?topic=2959.15
ā¦but ran into multiple issues getting through anything. first:
sudo pacman-mirrors -g # This will update the mirrors
sudo pacman -Syy # This will sync your local package-list
sudo pacman -S gnupg # This will (re-)install your gpg-keys
sudo pacman-key --populate archlinux manjaro # This will re-populate your Arch- & Manjaro-keys
sudo pacman-key --refresh-keys # This will refresh your pacman-keys
sudo pacman -S archlinux-keyring # This will install the archlinux-keyring
sudo pacman -Syyu # This will finally upgrade all your packages
I got to second line and this is what I get:
> sudo pacman -Syy
:: Synchronizing package databases...
error: failed to update core (unable to lock database)
error: failed to update extra (unable to lock database)
error: failed to update community (unable to lock database)
error: failed to update multilib (unable to lock database)
error: failed to synchronize all databases
So I followed up with the next:
sudo rm -R /etc/pacman.d/gnupg/
sudo rm -R /root/.gnupg/
sudo gpg --refresh-keys
sudo pacman-key --init && pacman-key --populate archlinux manjaro
sudo pacman-key --refresh-keys
got all the way to the last line thinking, OMG Iām saved but insteadā¦
> sudo pacman-key --refresh-keys
gpg: refreshing 139 keys from hkps://hkps.pool.sks-keyservers.net
gpg: keyserver refresh failed: General error
==> ERROR: A specified local key could not be updated from a keyserver.
Iām so hoping someone can help me get out of this. I am trying so hard just to get to work. I donāt know what Iām missingā¦ I seem to fix one thing just to have something else break on me. My system was fine till I found out it wasnāt able to detect my audio interface due to being on a RT kernel. Once I switched to the newest stable (I think)ā¦ it picked it up without me even askingā¦ at the same time, I lose my dual monitors because for some reason I canāt install the graphics card because of this keyring issueā¦ that was never a problem before, until now, when I needed to get nvidia drivers. But this pgp problem has been here from the get go. I need to find a solution or iām just gonna have to can it and move on to something else so I can have my studio back. 
