How To Fix “invalid or corrupted package (PGP signature)” Error In Arch Linux

This brief guide describes how to fix invalid or corrupted package (PGP signature) error in Arch Linux and its variants like EndeavourOS and Manjaro Linux.

The other day I encountered with the following error when I tried to upgrade my Arch Linux system using command 'sudo pacman -Syu':

[...]
:: File /var/cache/pacman/pkg/libpsl-0.16.1-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] y
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.

Then, I ran 'sudo pacman -Syyu' command, but still no luck. I kept getting the same error no matter how many times I tried. 

After a bit of search on Google and Arch Linux forums, I found that there are new keys in the archlinux-keyring package.

Fix "invalid or corrupted package (PGP signature)" error in Arch Linux

To solve "invalid or corrupted package (PGP signature)" error in Arch Linux, we need to update the archlinux-keyring package.

To do so, run:

$ sudo pacman -S archlinux-keyring

Sample output:

resolving dependencies...
looking for conflicting packages...

Packages (1) archlinux-keyring-20170104-1

Total Installed Size: 0.81 MiB
Net Upgrade Size: 0.04 MiB

:: Proceed with installation? [Y/n] y
(1/1) checking keys in keyring [######################] 100%
(1/1) checking package integrity [######################] 100%
(1/1) loading package files [######################] 100%
(1/1) checking for file conflicts [######################] 100%
(1/1) checking available disk space [######################] 100%
:: Processing package changes...
(1/1) upgrading archlinux-keyring [######################] 100%
==> Appending keys from archlinux.gpg...
gpg: marginals needed: 3 completes needed: 1 trust model: PGP
gpg: depth: 0 valid: 1 signed: 6 trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: depth: 1 valid: 6 signed: 69 trust: 0-, 0q, 0n, 6m, 0f, 0u
gpg: depth: 2 valid: 69 signed: 7 trust: 69-, 0q, 0n, 0m, 0f, 0u
gpg: next trustdb check due at 2017-09-07
==> Locally signing trusted keys in keyring...
 -> Locally signing key 0E8B644079F599DFC1DDC3973348882F6AC6A4C2...
 -> Locally signing key 684148BB25B49E986A4944C55184252D824B18E8...
 -> Locally signing key 91FFE0700E80619CEB73235CA88E23E377514E00...
 -> Locally signing key 44D4A033AC140143927397D47EFD567D4C7EA887...
 -> Locally signing key 27FFC4769E19F096D41D9265A04F9397CDFD6BB0...
 -> Locally signing key AB19265E5D7D20687D303246BA1DFB64FFF979E7...
==> Importing owner trust values...
==> Disabling revoked keys in keyring...
 -> Disabling key F5A361A3A13554B85E57DDDAAF7EF7873CFD4BB6...
 -> Disabling key 7FA647CD89891DEDC060287BB9113D1ED21E1A55...
 -> Disabling key D4DE5ABDE2A7287644EAC7E36D1A9E70E19DAA50...
 -> Disabling key BC1FBE4D2826A0B51E47ED62E2539214C6C11350...
 -> Disabling key 9515D8A8EAB88E49BB65EDBCE6B456CAF15447D5...
 -> Disabling key 4A8B17E20B88ACA61860009B5CED81B7C2E5C0D2...
 -> Disabling key 63F395DE2D6398BBE458F281F2DBB4931985A992...
 -> Disabling key 0B20CA1931F5DA3A70D0F8D2EA6836E1AB441196...
 -> Disabling key 8F76BEEA0289F9E1D3E229C05F946DED983D4366...
 -> Disabling key 66BD74A036D522F51DD70A3C7F2A16726521E06D...
 -> Disabling key 81D7F8241DB38BC759C80FCE3A726C6170E80477...
 -> Disabling key E7210A59715F6940CF9A4E36A001876699AD6E84...
==> Updating trust database...
gpg: next trustdb check due at 2017-09-07

The above command will update the new keys and disable the revoked keys in your Arch Linux system.

Again, I tried to upgrade my Arch Linux using command:

$ sudo pacman -Syu

This time the upgrade process went well without any issues.