11/28/2023 0 Comments Sudo password for![]() Solving Case #2 – Granting sudo Privileges to Users Or else, under the condition that a user has been removed from the admin group, run the following command: # adduser username admin ![]() Note: Remember to use the actual username on the system, in my case, it is aaronkilik. Ubuntu Mount Filesystem Solving Case #1 – Add User to sudo or admin GroupĪssuming that a user has been removed from the sudo group, to add the user back to the sudo group issue the command below: # adduser username sudo As we had seen before, the filesystem is mounted as read-only, therefore, to make changes to the system we need to remount is as read/write by running the command below: # mount -o rw,remount / Next, press Enter for maintenance: Ubuntu MaintenanceĪt this point, you should be at the root shell prompt. Ubuntu Recovery Menu – Drop to root Shell Prompt Move over to the line “ root Drop to root shell prompt”, then hit Enter. Ubuntu Recovery Modeīelow is the “ Recovery menu”, indicating that the root filesystem is mounted as read-only. You will be at the interface below, select the kernel with the “ recovery mode” option as below and press Enter to advance to the “ Recovery menu”. Using the Down Arrow, select “ Advanced options for Ubuntu” and press Enter. On the other hand, if you are running a dual-boot ( Ubuntu alongside Windows or Mac OS X), then you should see the Grub boot menu by default. If you happen to be running only Ubuntu on your machine, after powering it, press the Shift key for a few seconds to get the Grub boot menu. What if you are denied usage of sudo due to one or more of the reasons we mentioned above.īelow is an image showing a case in which the default system user is being prevented from running the sudo command: ~ $ sudo visudoĪaronkilik is not in the sudoers file. ![]() In order to perform crucial tasks on your system such as viewing or altering important system files, or updating the system, you need the sudo command to gain superuser privileges. The permission on /etc/sudoers file is not set to 0440.The /etc/sudoers file was altered to prevent users in the sudo or admin group from elevating their privileges to that of root using the sudo command.A user should not have been removed from the sudo or admin group.This can be absolutely devastating.Ī broken sudo may be caused by any of the following: However, this can be very dangerous in so many ways – one could be that the root user might enter a wrong command and breaks the whole system or an attacker gets access to a root user account and takes control of the whole system and who knows what he/she can possibly do.īased upon this background, in Ubuntu and Ubuntu derivatives, the root user account is locked by default, regular users (system administrators or not) can only gain superuser privileges by using the sudo command.Īnd one of the worst things that can happen to a Ubuntu System admin is losing privileges to use the sudo command, a situation commonly referred to as “ broken sudo”. root command prompt in this case normally would display #.In Unix/Linux systems, the root user account is the super user account, and it can therefore be used to do anything and everything achievable on the system. ![]() To run these commands, first su to an account that allows them to run eg. Normally the command prompt displays $ and sudo commands may not run it won't even accept the Admin or root passwords. The sudo commands can also be run when logged in to an Admin account, after entering su or su root in Terminal. When done, you may log back into your Admin account and Disable Root User. The sudo commands should work from this account. Log out of your current account, and log into the root account via username: root Then from Edit menu -> Enable Root User, then enter some password. It can also be accessed via Menu bar: Apple -> System Preferences -> Accounts -> Login Options -> Join - > Open Directory Utility. Mine was located at /System/Library/CoreServices. If you are able to log in to an Admin account to your iMac, access Directory Utility and 'click the lock to make changes'. ![]() You'll just get an error that password is incorrect, even if you enter your current Admin password. Sudo passwd root command will NOT work unless Root User is enabled. "Change Root Password" is only available if Root User is enabled. ![]()
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