I did a fresh install of Parrot-security-4.11_amd64.iso yesterday. When launching Synaptic, it asks for the root password, not the sudoer password. Someone on the Facebook Parrot OS (Official Group) is reporting the same issue. I had to create a password for root as the Calamares installer didn’t ask for one.
uname -a
Linux zazu 5.10.0-5parrot1-amd64 #1 SMP Debian 5.10.24-5parrot1 (2021-03-20) x86_64 GNU/Linux
cat /etc/*release
DISTRIB_ID=Parrot
DISTRIB_RELEASE=4.11
DISTRIB_CODENAME=rolling
DISTRIB_DESCRIPTION=“Parrot OS 4.11”
PRETTY_NAME=“Parrot OS 4.11”
NAME=“Parrot OS”
ID=parrot
ID_LIKE=debian
VERSION=“4.11”
VERSION_ID=“4.11”
Parrot Security 4.11 is installed on a UEFI bootable USB thumbdrive (LUKS encrypted) running on the latest VirtualBox for Windows.