我有一个/etc/apt/sources.list.d
文件,其中包含以下行
deb https://download.01.org/gfx/ubuntu/16.04/main wily main #Intel Graphics drivers
现在,当我尝试时apt-get upgrade
,我收到一条消息:
W: GPG error: https://download.01.org/gfx/ubuntu/16.04/main wily InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2CC2A1B90A3B3268
为什么存储库未签名?我该怎么办?