Ubuntu configuration file location

System initialization
/Etc/timezone Time Zone
/Etc/inetd. conf super Process
File System
/Etc/fstab file system mounted at startup
/Etc/mtab file system currently mounted
User System
/Etc/passwd user information
/Etc/shadow User Password
/Etc/group information
/Etc/gshadow group password
/Etc/sudoers sudoer list (use the "Modify do" command to modify this file instead of editing it directly)
Shell
/Etc/Shell available shell list
/Etc/inputrc Readline control settings
/Etc/profile user preferences
/Etc/bash. bashrc bash configuration file
System Environment
/Etc/environment variable
/Etc/updatedb. conf file to retrieve database configuration information
/Etc/issue release information
/Etc/issue.net
/Etc/screenrc Screen Settings
Network
/Etc/iftab Nic MAC Address binding
/Etc/hosts host list
/Etc/hostname Host Name
/Etc/resolv. conf domain name resolution server address
/Etc/Network/interfaces Nic configuration file