Linux Lite Forums

Software - Support => Installing Software => Topic started by: panameagle7 on January 14, 2021, 12:55:13 AM

Title: Authentication failiure
Post by: panameagle7 on January 14, 2021, 12:55:13 AM

I was following the instruction to install a Brother printer MFC-L6510DW on my Linux Lite, but when I get to the 2nd step that is go to "super user" (su) or (sudo su) I get the message Authentication Failure when I put the password, and I only have one password for that OS. What am I missing or do wrong? why do I get that message? I can't complete the installation because of that. Would somebody help me?

Title: Re: Authentication failiure
Post by: stevef on January 14, 2021, 01:50:29 AM

What instructions are you following ?

The 'su' command in Linux Lite will give Authenticate Failure because there is no 'root' account by default.

The command 'sudo su' followed by your normal password should elevate your session to superuser mode with a warning and a changed prompt.

Title: Re: Authentication failiure
Post by: firenice03 on January 14, 2021, 09:49:56 AM

@panameagle7
If you're running a command you can precede with sudo to give elevated root access. ie..

Code: [Select]

sudo df -hWill run df -h as root... you will be prompted for a password - your user password...


If the instruction your following suggest "su" or "su -", switching to root, it may be for another derivative like CentOS etc..
Feel free to post link/question for added clarification...

Title: Re: Authentication failiure
Post by: panameagle7 on January 15, 2021, 01:27:04 PM

Thank you Firenice03, that work perfectly, good lesson learned, really appreciate it.

Now, I was following the direction to install the drive for Brother MFC-J6510DW, first step turn the download on a black file, nothing else is in there, so after running the next step, now that I can used "sudo su", got the message:

Driver-packages cannot be found.
 Confirm the model name.

At the end still can install the Brother Driver, I am running a Ubuntu Studio on a Desktop, and I did not have any problem downloading the driver, but with this hp laptop, that I have LinuxLite does not letting me.

Title: Re: Authentication failiure
Post by: firenice03 on January 16, 2021, 07:23:18 PM

@panameagle7

So I got caught up in the sudo - thinking you needed to run an installer as root...

So for the Brother - I would take a look at the following links..
https://www.linuxliteos.com/manual/hardware.html#printer

Which at the end will allow you to go to Brothers site for the driver..
- and... MFC-L6510DW is not a valid model --- BUT MFC-J6510DW is....   https://support.brother.com/g/b/producttop.aspx?c=us&lang=en&prod=mfcj6510dw_all