Comment 3 for bug 1964562

ON p360-tiny-2, I could install the meta packages successfully after enabled the proposed channel.

u@P360-tiny-2:~$ apt-cache policy oem-sutton.simon-cais-meta
oem-sutton.simon-cais-meta:
  Installed: (none)
  Candidate: 20.04~ubuntu1
  Version table:
     20.04~ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu focal-proposed/main i386 Packages
u@P360-tiny-2:~$ sudo apt install oem-sutton.simon-cais-meta
Get:1 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64 oem-sutton.simon-cais-meta all 20.04~ubuntu1 [2,072 B]
Fetched 2,072 B in 1s (3,807 B/s)
Selecting previously unselected package oem-sutton.simon-cais-meta.
(Reading database ... 217497 files and directories currently installed.)
Preparing to unpack .../oem-sutton.simon-cais-meta_20.04~ubuntu1_all.deb ...
Unpacking oem-sutton.simon-cais-meta (20.04~ubuntu1) ...
Setting up oem-sutton.simon-cais-meta (20.04~ubuntu1) ...
u@P360-tiny-2:~$ sudo apt update

u@P360-tiny-2:~$ apt-cache policy oem-sutton.simon-cais-meta
oem-sutton.simon-cais-meta:
  Installed: 20.04~ubuntu1
  Candidate: 20.04ubuntu1
  Version table:
     20.04ubuntu1 500
        500 http://lenovo.archive.canonical.com focal/sutton.simon amd64 Packages
        500 http://lenovo.archive.canonical.com focal/sutton.simon i386 Packages
 *** 20.04~ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu focal-proposed/main i386 Packages
        100 /var/lib/dpkg/status
u@P360-tiny-2:~$ sudo apt install oem-sutton.simon-cais-meta