gpg: Note: signature key 6ED91CA3AC1160CD expired 2021-06-16 00:16:24
pub rsa4096 2017-09-28 [SCE]
C95B321B61E88C1809C4F759DDCAE044F796ECB0
uid NVIDIA CORPORATION (Open Source Projects) <[email protected]>
sub rsa2048 2019-09-18 [S] [expired: 2021-06-16]
so this key file has been expired now more than 4 years. Please roll new key and then roll out all packages made using old key with new valid key.