I can confirm the issue after a fresh install of Lubuntu 20.04 on an old Asus X201E.
I could revert the behaviour to normal deleting adm and sudo from second user groups. It seems that Lubuntu 20.04 accepts only one admin...
I can confirm the issue after a fresh install of Lubuntu 20.04 on an old Asus X201E.
I could revert the behaviour to normal deleting adm and sudo from second user groups. It seems that Lubuntu 20.04 accepts only one admin...