Many times when i was installing "Theos"
on my iOS device everything went well till the last step which is "apt-get
update". When i ran the command, it would always give me an error "W: GPG error: http://coredev.nl iphone
Release: The following signatures couldn’t be verified because the public key
is not available: NO_PUBKEY" as shown in the below screenshot.
After much googling, i found this link which explains
the solution to this issue. Though the scenario in the link is different than
mine, however it seemed to work well for me :)
The solution was, navigate to the sources.list.d folder and add
the "public key" to
that folder. This can be done wither by using "lynx" or by using "wget".
A shown in the above screenshot, apt-get works well after the
above steps were followed.
References: