I am having the same issue and already tried everything still i get:
sudo pacman -Syyu
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
:: Synchronizing package databases…
core 168.6 KiB 1074 KiB/s 00:00 [######################] 100%
extra 1923.8 KiB 8.66 MiB/s 00:00 [######################] 100%
community 6.6 MiB 14.2 MiB/s 00:00 [######################] 100%
multilib 177.4 KiB 4.33 MiB/s 00:00 [######################] 100%
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: failed to synchronize all databases (invalid or corrupted database (PGP signature))
I already did all of the helps (from old archived manjaro posts) but I have no Idea what is going wrong here. There is already something confusing when I do sudo pacman-key --populate archlinux manjaro:
sudo pacman-key --populate archlinux manjaro
==> Appending keys from archlinux.gpg…
==> Appending keys from manjaro.gpg…
==> Locally signing trusted keys in keyring…
gpg: checking the trustdb
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 1EB2638FF56C0C53: no user ID for key signature packet of class 10
gpg: key 1EB2638FF56C0C53: no user ID for key signature packet of class 10
then update keys
sudo pacman-key --refresh-keys
gpg: key 3348882F6AC6A4C2: “Pierre Schmitz (Arch Linux Master Key) pierre@master-key.archlinux.org” not changed
gpg: Total number processed: 1
gpg: unchanged: 1
pub rsa3072 2011-11-18 [SC]
0E8B644079F599DFC1DDC3973348882F6AC6A4C2
uid [ full ] Pierre Schmitz (Arch Linux Master Key) pierre@master-key.archlinux.org
sub rsa1024 2011-11-18 [E]
sub rsa3072 2011-11-18 [A]
gpg: error retrieving ‘dan@master-key.archlinux.org’ via WKD: No data
gpg: error reading key: No data
and back to the old error…