The configuration below is in my /etc/sudoers:

Defaults    !visiblepw
Defaults    always_set_home
Defaults    env_reset
Defaults    env_keep =  "COLORS EDITOR DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS"
Defaults    env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE"
Defaults    env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES"
Defaults    env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE"
Defaults    env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY"
Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin

When I sudo su my PS1 terminal changes to the system default; ignoring my .bashrc PS1 setting. How can I fix this so that the environment variables are not lost when sudo suing?

Weird; it's exporting EDITOR but it's not exporting PS1 for some reason; it's like it's being forcefully overridden; how can I stop this?

The configuration below is in my /etc/sudoers:

Defaults    !visiblepw
Defaults    always_set_home
Defaults    env_reset
Defaults    env_keep =  "COLORS EDITOR DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS"
Defaults    env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE"
Defaults    env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES"
Defaults    env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE"
Defaults    env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY"
Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin

When I sudo su my PS1 terminal changes to the system default; ignoring my .bashrc PS1 setting. How can I fix this so that the environment variables are not lost when sudo suing?

Weird; it's exporting EDITOR but it's not exporting PS1 for some reason; it's like it's being forcefully overridden; how can I stop this?

When I run sudo -V the variables to keep PS1 is listed; it's not listed in the variables to remove.