Can't use SNMP v3 AES-192 and AES-256 encryption?

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I installed it exactly on Ubuntu 20.04 and I still don’t get the option to select 256.

root@CheckMK:~# uname -a
Linux CheckMK 5.4.78-2-pve #1 SMP PVE 5.4.78-2 (Thu, 03 Dec 2020 14:26:17 +0100) x86_64 x86_64 x86_64 GNU/Linux
root@CheckMK:~# apt list snmp -a
Listing... Done
snmp/focal-updates,focal-security 5.8+dfsg-2ubuntu2.3 amd64
snmp/focal 5.8+dfsg-2ubuntu2 amd64