Error “error: GPGME error: No data. error: failed to synchronize all databases (unexpected error)” (SOLVED)

When updating the package cache with the pacman package manager, for example, when running the following command to update package information and update the system:

sudo pacman -Syu

An error may occur:

error: GPGME error: No data
:: Synchronizing package databases...
 core                  155.5 KiB   444 KiB/s 00:00 [######################] 100%
 extra is up to date
 community is up to date
 multilib is up to date
 blackarch is up to date
error: GPGME error: No data
error: failed to synchronize all databases (unexpected error)

To fix the error, run the following command:

sudo rm -R /var/lib/pacman/sync

And then run the system update command again:

sudo pacman -Syu

This time the error should be gone.

Cause “error: GPGME error: No data. error: failed to synchronize all databases (unexpected error)” may be the following situation: you have exhausted the limit of your Internet connection and instead of the requested data, your Internet provider shows its page with information about the need to replenish the balance. As a result, incorrect data is sent in response to outgoing Internet connections, although the connection is successful from the point of view of the computer.

That is, pacman asks for information about the packages, but the ISP sends the data to show the Captive Portal. As a result of this, pacman has the indicated error. To fix it, you need to delete the cached data, which is done by the above command.