Looking for logging into the Raspberry Ubuntu Server Standard site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Raspberry Ubuntu Server Standard site. After that you can login as usual with your login credentials.
https://www.raspberrypi.org/forums/viewtopic.php?t=101141
https://raspberrypi.stackexchange.com/questions/68257/ubuntu-server-16-04-1-ubuntu-ubuntu-login-incorrect
https://howchoo.com/g/m2qwytdmmjn/raspberry-pi-default-username-and-password
https://wiki.ubuntu.com/ARM/RaspberryPi
https://blog.ubuntu.com/2016/06/20/howto-classic-apt-based-ubuntu-16-04-lts-server-on-the-rpi2
https://forum-raspberrypi.de/forum/thread/10726-default-username-password/?postID=91578
https://ubuntu-mate.community/t/what-is-the-root-password-of-ubuntu-mate-16-04-2-lte/12918
https://askubuntu.com/questions/189907/what-is-the-default-root-password
http://www.raspberry-pi-geek.com/howto/Passwords
https://www.youtube.com/watch?v=zgoWIGXMHfM
https://www.giga.de/zubehoer/raspberry-pi/tipps/raspberry-pi-login/
https://www.modmypi.com/blog/how-to-change-the-default-account-username-and-password
https://www.elektronik-kompendium.de/sites/raspberry-pi/2109021.htm