New clean install of Ubuntu Server 21.10 64-bit on Raspberry Pi 4, 4GB.
I also tested & installed on the Ubuntu LTS 64-bit, the error is only displayed on new 21.10 version, tested on 2 different Pi's, same error for 21.10 Server 64-bit
Expected Behaviour:
No error should display
Actual Behaviour:
Receiving error after hitting save but I believe the settings actually may have saved. This is while on the DNS settings page.
"PHP error (2): Undefined array key "v6_2" in /var/www/html/admin/scripts/pi-hole/php/savesettings.php:212"