Failed signature check during core packages installation

[cvandeplas]

Latest OSMC version on a Raspberry pi 4. Failed signature check for many packages during step 3: basic install : It looks like the retropie GPG key is not known.

From https://retropie.org.uk/forum/topic/28002/gpg-server-error-when-trying-to-update-retropie-packages/8 I did

$ sudo gpg --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys DC9D77FF8208FFC51D8F50CCF1B030906A3B0D31
gpg: key F1B030906A3B0D31: public key "RetroPie Project <retropieproject@gmail.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1

Re-ran install core packages/basic install and installation worked.

[hissingshark]

Already fixed from a slightly different angle, but thank you. I commented on the PR.