How to tell if my ubuntu is protected against the KRACK attack ?

How can one make sure that one's ubuntu is protected against the infamous KRACK attack, that newly discovered WPA2 security flaw ? 

Well, according to USN-3455-1, the updates are available. All One needs to do is "After a standard system update you need to reboot your computer to make all the necessary changes."

And how can one be sure that everything is ok ?
After the: sudo apt-get update && sudo apt-get upgrade
and the following reboot-
1)check your version by cat /etc/lsb-release
2)check your installation history of wpasupplicant and hostapd  by-
sudo apt-get changelog wpasupplicant

sudo apt-get changelog hostapd

3) and if you are hysterical enough, verify the currently installed versions of hostapd and wpasupplicant by:
sudo apt-cache policy hostapd
sudo apt-cache policy wpasupplicant

(The USN details the relevant package version you wish to see at this stage). 

Further reading

• WPA2 has a dangerous flaw in design (and an even more dangerous bug in Linux implementations)
• USN-3455-1: wpa_supplicant and hostapd vulnerabilities
• Has Ubuntu been patched against the KRACK attack?
• Key Reinstallation Attacks: Forcing Nonce Reuse in WPA2 (the paper, in PDF format)