When i tried to update by " sudo apt-get update" it comes out by following error :
" The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEB"
I’ve tried fix the error using the command “sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys” or “sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys”
the result is like this :
Executing: /tmp/apt-key-gpghome.Qo5UGYxFIW/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys FEEA9169307EA071
gpg: key FEEA9169307EA071: 1 duplicate signature removed
gpg: key FEEA9169307EA071: “Rapture Automatic Signing Key (cloud-rapture-signing-key-2021-03-01-08_01_09.pub)” not changed
gpg: Total number processed: 1
gpg: unchanged: 1
And the error has not fixed. Anyone know how to fix this ?