@kaihengfeng added the following to /etc/apt/sources.list but still no luck!
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
apt install linux-oem-20.04c Reading package lists... Done Building dependency tree... Done Reading state information... Done E: Unable to locate package linux-oem-20.04c E: Couldn't find any package by glob 'linux-oem-20.04c'
@kaihengfeng added the following to /etc/apt/ sources. list but still no luck!
deb http:// archive. ubuntu. com/ubuntu/ focal-updates main restricted universe multiverse archive. ubuntu. com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://
apt install linux-oem-20.04c
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package linux-oem-20.04c
E: Couldn't find any package by glob 'linux-oem-20.04c'