My account became administrator by default, but then I changed it to standard. From that instant, I'm asked for the root password to upgrade software, for authentication and also to edit user settings.
How can I resolve this?
My account became administrator by default, but then I changed it to standard. From that instant, I'm asked for the root password to upgrade software, for authentication and also to edit user settings.
How can I resolve this?
You can set it from the Recovery Menu when you boot your system up. Here is some good step by step instructions on getting your system into Recovery Mode so that you can fix the user settings. The biggest part is to get the root partition mounted in Read / Write so you can make changes to the user account.
http://www.sysads.co.uk/2014/05/reset-lost-root-password-ubuntu-14-04/
After you have the system booted to Recovery Mode doing the root that they show, type in the following to add your user back to sudo
usermod -a -G sudo username
where you will replace username with your own username.
Reboot your system, and you should have sudo capabilities back on your account.