Get:1 http://kali.koyanet.lv/kali kali-rolling InRelease [30.5 kB]
Err:1 http://kali.koyanet.lv/kali kali-rolling InRelease
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali
Linux Repository 
Hit:2 https://packages.microsoft.com/repos/microsoft-debian-stretch-prod
stretch InRelease
Reading package lists… Done
W: GPG error: http://kali.koyanet.lv/kali kali-rolling InRelease: The fo
llowing signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux R
epository 
E: The repository ' http://http.kali.org/kali kali-rolling InRelease' is
not signed.
N: Updating from such a repository can't be done securely, and is theref
ore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configurat
ion details.