Do you have automatic updates enabled?
I am not sure when you purchased, but since you joined the forum, there have been a minimum of three sets come down the pipe.
Which has even been verified by users asking about them on the forum.
You can check when the last update stamp was:
ls -l /var/lib/apt/periodic/update-success-stamp
Or last apt package flow:
ls -l /var/log/apt/history.log
Or run
sudo apt update
and see if anything is awaiting. I just did... and sure enough:
31 packages can be upgraded. Run 'apt list --upgradable' to see them.
31? I just upgraded yesterday! Well, ok then...
Let's see what they are:
Summary
apt list -u
Listing... Done
apport/focal-updates,focal-updates 2.20.11-0ubuntu27.27 all [upgradable from: 2.20.11-0ubuntu27.26]
avahi-autoipd/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
avahi-daemon/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
avahi-utils/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
cups-bsd/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-client/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-common/focal-updates,focal-updates,focal-security,focal-security 2.3.1-9ubuntu1.3 all [upgradable from: 2.3.1-9ubuntu1.2]
cups-core-drivers/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-daemon/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-ipp-utils/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-ppdc/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
cups-server-common/focal-updates,focal-updates,focal-security,focal-security 2.3.1-9ubuntu1.3 all [upgradable from: 2.3.1-9ubuntu1.2]
cups/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
exaile/focal,focal 4.1.3~beta3-0ubuntu0 all [upgradable from: 4.1.2-0ubuntu0]
libavahi-client3/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-common-data/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-common3/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-compat-libdnssd1/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-core7/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-glib1/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libavahi-ui-gtk3-0/focal-updates,focal-security 0.7-4ubuntu7.2 amd64 [upgradable from: 0.7-4ubuntu7.1]
libcups2/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
libcupsimage2/focal-updates,focal-security 2.3.1-9ubuntu1.3 amd64 [upgradable from: 2.3.1-9ubuntu1.2]
linux-generic-hwe-20.04/focal-updates,focal-security 5.15.0.73.80~20.04.34 amd64 [upgradable from: 5.15.0.72.79~20.04.33]
linux-headers-generic-hwe-20.04/focal-updates,focal-security 5.15.0.73.80~20.04.34 amd64 [upgradable from: 5.15.0.72.79~20.04.33]
linux-image-generic-hwe-20.04/focal-updates,focal-security 5.15.0.73.80~20.04.34 amd64 [upgradable from: 5.15.0.72.79~20.04.33]
linux-libc-dev/focal-updates,focal-security 5.4.0-150.167 amd64 [upgradable from: 5.4.0-149.166]
mokutil/focal-updates 0.6.0-2~20.04.1 amd64 [upgradable from: 0.3.0+1538710437.fb6250f-1]
python3-apport/focal-updates,focal-updates 2.20.11-0ubuntu27.27 all [upgradable from: 2.20.11-0ubuntu27.26]
python3-problem-report/focal-updates,focal-updates 2.20.11-0ubuntu27.27 all [upgradable from: 2.20.11-0ubuntu27.26]
tzdata/focal-updates,focal-updates 2023c-0ubuntu0.20.04.2 all [upgradable from: 2023c-0ubuntu0.20.04.1]