Comment 2 for bug 1980589

I have seen the same today on a RISC-V system on Jammy

Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.17.0-1002-allwinner riscv64)

 * Documentation: https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support: https://ubuntu.com/advantage

  System information as of Fri Jul 8 13:28:53 UTC 2022

  System load: 0.55224609375
  Usage of /: 9.6% of 28.68GB
  Memory usage: 19%
  Swap usage: 0%
  Temperature: 49.9 C
  Processes: 98
  Users logged in: 1
  IPv4 address for eth0: 192.168.123.96
  IPv6 address for eth0: 2002:3e8f:5e6d:0:e075:70ff:fe58:b3e1

15 updates can be applied immediately.
14 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable

Last login: Fri Jul 8 14:34:47 2022
ubuntu@ubuntu:~$ sudo apt-get dist-upgrade
[sudo] password for ubuntu:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
ubuntu@ubuntu:~$

After running sudo apt-get update the difference vanishes.