Error while installing NordVPN

Hello so when I am trying to install NordVPN on bazzite according to the instructions I get the following error in the terminal

error: can't create transaction lock on /usr/share/rpm/.rpm.lock (Read-only file system)
error: https://repo.nordvpn.com/gpg/nordvpn_public.asc: key 1 import failed.

How can I fix this
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