[arch-general] Installing sage-mathemtics failed

[Csányi Pál]

Hi,

I just want to install sage-mathematics, but get error messages:

sudo pacman -S sage-mathematics
resolving dependencies...
looking for inter-conflicts...

Packages (1): sage-mathematics-6.2-2

Total Installed Size:   2444.61 MiB

:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring
[#######################################] 100%
downloading required keys...
:: Import PGP key 4096R/, "Evgeniy Alekseev <darkarcanis at mail.ru>",
created: 2013-10-18? [Y/n]
error: key "Evgeniy Alekseev <darkarcanis at mail.ru>" could not be imported
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.


What can I do to solve this problem?

-- 
Regards from Pal