Comment 21 for bug 1836475

Looks good to me:

| ubuntu@juju-87625f-hloeung-100:/etc/apt$ sudo apt-get install update-notifier-common
| Reading package lists... Done
| Building dependency tree
| Reading state information... Done
| The following packages were automatically installed and are no longer required:
| dnsmasq-base kpartx libfl2 libidn11 libsgutils2-2 liburcu6 sg3-utils sg3-utils-udev
| Use 'sudo apt autoremove' to remove them.
| The following packages will be upgraded:
| update-notifier-common
| 1 upgraded, 0 newly installed, 0 to remove and 44 not upgraded.
| Need to get 133 kB of archives.
| After this operation, 0 B of additional disk space will be used.
| Get:1 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64 update-notifier-common all 3.192.30.9 [133 kB]
| Fetched 133 kB in 0s (3458 kB/s)
| (Reading database ... 130802 files and directories currently installed.)
| Preparing to unpack .../update-notifier-common_3.192.30.9_all.deb ...
| Unpacking update-notifier-common (3.192.30.9) over (3.192.30.8) ...
| Setting up update-notifier-common (3.192.30.9) ...
| Installing new version of config file /etc/cron.weekly/update-notifier-common ...

Comparing it with the old backup copy:

| ubuntu@juju-87625f-hloeung-100:/etc/apt$ diff -Naurp ~/update-notifier-common /etc/cron.weekly/update-notifier-common
| --- /home/ubuntu/update-notifier-common 2021-08-13 05:55:55.859177053 +0000
| +++ /etc/cron.weekly/update-notifier-common 2021-08-05 14:01:11.000000000 +0000
| @@ -4,5 +4,12 @@ set -e
|
| [ -x /usr/lib/ubuntu-release-upgrader/release-upgrade-motd ] || exit 0
|
| -# Check to see whether there is a new version of Ubuntu available
| -/usr/lib/ubuntu-release-upgrader/release-upgrade-motd
| +sleep_then_check() {
| + # Sleep for up to an hour to spread the load of checking for updates on
| + # the Ubuntu infrastructure
| + sleep $(shuf -i 1-3600 -n 1)
| + # Check to see whether there is a new version of Ubuntu available
| + /usr/lib/ubuntu-release-upgrader/release-upgrade-motd
| +}
| +
| +sleep_then_check &

| ubuntu@juju-87625f-hloeung-100:/etc/cron.weekly$ apt-cache policy update-notifier-commonupdate-notifier-common:
| Installed: 3.192.30.9
| Candidate: 3.192.30.9
| Version table:
| *** 3.192.30.9 500
| 500 http://us.archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
| 100 /var/lib/dpkg/status
| 3.192.30.8 500
| 500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
| 3.192.30 500
| 500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages