, когда я устанавливаю TOSSIM-симулятор, я сталкиваюсь со следующей проблемой:
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys DBCA24B8A9B913B9
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.Agyl9rHyvt --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys DBCA24B8A9B913B9
gpg: requesting key A9B913B9 from hkp server keyserver.ubuntu.com
?: keyserver.ubuntu.com: Connection refused
gpgkeys: HTTP fetch error 7: couldn't connect: Connection refused
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0