Not able to verify download


#1

I downloaded turtl on a linux system but was not able to import the key to my gpg.
The wget seems to be working normally, and the key is saved to turtl.asc
Then I did gpg --import turtl.asc, and it keeps saying that 1 signature not checked due to a missing key.
image

Is there anything I can do with this?
Thanks in advance!