I’m trying to install rvm through pikaur, but i receive the error in the title.
I have looked for a solution for a lot, and most of the people who seem to have solved issues with the same error message (different keyid and package) did so with
gpg --recv-key KEYID
It didnt work for me. The key was added (both with sudo and without it) but the error stood.
Some of them specified a keyserver with
gpg --keyserver SOME_URL --recv-key KEYID
and i tried a couple of those too, but nothing changed. Maybe i need to use a specific keyserver? I don’t even know which one i am using.
Is there anything else that might cause this problem?
You can see from the comments on the AUR page (AUR (en) - rvm) that other people have the same problem.
However, it works with pamac build rvm
You will be asked to import the keys.
unknown public key 105BD0E739499BDB
That is only a part (the last part) of the full key mentioned in the array:
validpgpkeys=(
'409B6B1796C275462A1703113804BB82D39DC0E3'
'7D2BAF1CF37B13E2069D6956105BD0E739499BDB'
)
7D2BAF1CF37B13E2069D6956105BD0E739499BDB
vs
105BD0E739499BDB
I don’t know what that array does in the PKGBUILD, what is checked. 
Perhaps try building it with pamac or yay instead of the tool you are using?
Or use makepkg to build it?
Or maybe you tried to import that partial key - which is not an existing key …
They are equal and represent the same key. One is the public key id, one is the fingerprint:
With pamac it installs but says that to use rvm i should do
source /var/tmp/pamac-build-valerio/rvm/src/rvm/scripts/rvm
However that command returns
bash: /var/tmp/pamac-build-valerio/rvm/src/rvm/scripts/rvm: No such file or directory
Never mind, i looked more in detail and found the rvm.sh file to source from, it was before the src folder (not present in my pc)