How can I disable auto login?

[Jasper]

I want Mint to ask for a login password. Unfortunately none of the solutions Google provides seem to apply to the latest version 20 with all updates.

Thank you

[JeremyB]

If you are using Cinnamon it is in the Login window settings, under users tab

[Jasper]

No sir. As I stated, that setting has no effect. I'm still logging in automatically and still have to input 2 passwords to connect to a network share. Time to reinstall.

[majpooper]

No sir. As I stated, that setting has no effect. I'm still logging in automatically and still have to input 2 passwords to connect to a network share. Time to reinstall.

I just did it so I know it is quite simple - but I may not be running the same version of MInt that you are.
here is what I am running - as you can see LM19.3 Cinnamon

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majpooper@1150z:~$ inxi -Fxz
System:    Host: 1150z Kernel: 5.4.0-54-generic x86_64 bits: 64 compiler: gcc v: 7.5.0 Desktop: Cinnamon 4.4.8 
           Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic 

If you type the command

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inxi -Fxz

in the terminal then someone with the same version can help you.
If it matches mine (LM 19.3 Cinnamon) or maybe even LM 20.x Cinnamon it is a two step process in System Settings > Login Window > Users
first, you have to move the slider to On to Allow Manual Login
second you need to delete the user that appears in the Username box in the Automatic Login section.

There is also away to accomplish by editing

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/etc/lightdm/lightdm.conf

but the System Settings GUI is the better way imo.

[Jasper]

I'm running the latest LM 20, all updates current. Thanks.

[JOPETA]

I wonder is you need to reconfigure lightdm (sudo dpkg-reconfigure ligtdm) if another dm was installed and/or using another greeter.

Anyway, be sure you/your user don't belong to nopasswdlogin group in Menu>Administration>Users and group or terminal with id.

[majpooper]

I wonder is you need to reconfigure lightdm (dpkg-reconfigure ligtdm) if another dm was installed and/or using another greeter.

Anyway, be sure you/your user don't belong to nopasswdlogin group in Menu>Administration>Users and group or terminal with id.

lightdm is the display manager installed for a Cinnamon install. IF it is an LM 20.x Cinnamon install. There is really no reason though to even mess with lightdm configuratio file

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/etc/lightdm/lightdm.conf

I shouldn't have brought it up. I have no idea what DMs are used with MATE or Xfce. But, yeah, you are correct if we are talking a different display manager than lightdm then re-config of the lightdm config file would make no sense if it even exists.

But at any rate without knowing what the DE the OP is using (Cinnamon, MATE or Xfce) it's hard to help.

[rene]

All editions of Mint use lightdm. OP seems not very keen on helping him or herself though anyway (i.e., you already advised checking and/or editing the config file directly if for some reason the GUI tool doesn't work) so I'd advise not being overly concerned either.

[Flemur]

No sir. As I stated, that setting has no effect.

No sir, you didn't state that.

Time to reinstall.

It might be easier to edit the lightdm.conf file.

[JOPETA]

have no idea what DMs are used with MATE or Xfce

Linux Mint now, only install lightdm by default in Mate, Cinnamon or Xfce. I was only wondering if OP has installed another desktop as gnome or KDE or packages native from those another desktop so another dm would be installed (gdm3 or sddm). DM reconfiguration is also needed sometimes when installing other packages (graphic drivers, xorg...).

[JeremyB]

have no idea what DMs are used with MATE or Xfce

Linux Mint now, only install lightdm by default in Mate, Cinnamon or Xfce. I was only wondering if OP has installed another desktop as gnome or KDE or packages native from those another desktop so another dm would be installed (gdm3 or sddm). DM reconfiguration is also needed sometimes when installing other packages (graphic drivers, xorg...).

We could find out if they post results from terminal for

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inxi -Sxxx

[JOPETA]

Yes, waiting for OP to comeback, as we can not discard anything (including no free space in root partition would explain why your first proposal didn't work), I think it is better the whole system information (inxi -Fxxxzr)

[Dave B]

Sometimes screenshots can be more helpful in explaining.

When a username is entered in the 'Username *' field (below example), then the system will automatically login.



With username removed (as below), future logins will require a password

[Vithyaathar]

Yeah, i had the same problem but finally i got it to work without reinstall..
I had this problem.. Even when i removed my name from Login window>Auto-login and rebooted my device, it got logged on automatically.. Hope this is the solution you're looking for...

STEP 1: On your desktop, right click and select open as root.. Enter your password when it prompts you..
STEP 2: Navigate to Filesystem>etc>lightdm>lightdm.conf
STEP 3: Open the file lightdm.conf with a text editor or something.. Remember that if you skipped step 1, you won't have overwrite privileges.
STEP 4: You'll find a line like
autologin-user=<your_username>
In that, replace your username with false (all lowercase) and hit save..
AND YOU"RE DONE!!! This worked for me when all the mentioned methods failed for me

[frostymusic]

DaveB, your suggestion worked for me Mint Mate 20

[open_sky]

In linux Mint 20.2 (Cinnamon 5) you need to type in your terminal:

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xed admin:///etc/lightdm/lightdm.conf

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autologin-user=false

Autologin must be with "false" key