There is a common problem under Mepis with adding new users, and it can produce the problems that you folks are talking about here. In short, the problem is that you might not have unchecked the box to disable the new account; or you might not have chosen a login shell. Please go to this link for a detailed newbie account of how to get your new user account working:
That link has screen shots. Here is a detailed set of step-by-step instructions for newbies:
This tip assumes that you are using KDE with Mepis. (I'm sorry, I don't know if GNOME is available with Mepis).
1) Click on the Kgear. For those of you who are Windows users moving to Mepis for the first time, the Kgear is in the lower left hand corner, where the Start button is in Windows.
2) Click System > Kuser.
3) You will be asked to type in your root user password. Please do so.
4) You will get a dialogue box called "KDE User Manager" or something like it. A screen shot of that dialogue box is attached as the first image below.
5) In the upper right hand corner, you will see a button called "Add User" or something similar. Click on it. You will get a dialogue box that asks you for the name of your user. Please type it and click okay. (I recommend that you type a simple name without dashes or spaces and in lower case. For now, just choose your first name. )
6) You will be taken to a dialogue box that looks like the second image attached below. Look for the field called "full name". Please type your full name here. Do not hit the OK button until I tell you to do so, because you are not done yet.
7) Look for the words "Login Shell". Beside those words is a field with the word "<Empty>" written just like that, except without the "quotes". Beside the word "<Empty>" is a little arrow pointing down. Click on it. You will see that you are given choices. Please click on /bin/bash . You are still not ready to click the OK button.
8) Now look down about four fields or so for the words "Account disabled." The box beside it should be checked. You MUST uncheck it, or you will not be able to use your user account. You are still not ready to click the OK button.
9) Now look for the Groups tab. It is at the top right hand side of the KDE User Manager dialogue box. Click on the Groups tab. You will see that there are a series of empty boxes with words beside them. Those words represent the groups to which your new user will belong. You must belong to a certain group to have its powers. For example, to have the power to hear audio, you must click the box beside audio. Be careful in choosing the powers that you give this user!! If you choose adm and root, you will give the user the right to make fundamental changes to your computer, including the power to destroy the data on the hard drive!!
10) After you have selected your groups for this user, you are done. You can now click the OK button. When you log out of the user that you were previously working under, you will see that your new user's account name in the log in menu. Click on that user's name, and type that user's password. You are good to go!
einfeldt at g mail dot com