My os is debian8,there are two account names ,one is root one is normal user named `debian8'.
I can login with both of them `root` and `debian8`.
Today ifound that `debian8` can't login into my os,`root` and its password can.
I am sure that the password for account name `debian8` is correct.
What' the matter with my os? How to fix it?

what will happen when you try to log in (using debian8)?
Is there any message?

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So, you can login root or tty*2( i.e: [Ctrl]+[Alt]+[F2])? Then see /home/debian8 also another live OS would work...

Login with `root` and its password.

echo "" > /var/log/auth.log

Logout and then login with `debian8` ,failed .
cat /var/log/auth.log

Jun 21 15:15:25 hwy lightdm: pam_unix(lightdm:session): session closed for user root
Jun 21 15:15:25 hwy polkitd(authority=local): Unregistered Authentication Agent for unix-session:3 (system bus name :1.21, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Jun 21 15:15:25 hwy lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Jun 21 15:15:25 hwy systemd-logind[695]: New session c3 of user lightdm.
Jun 21 15:15:28 hwy systemd-logind[695]: Removed session c2.
Jun 21 15:15:34 hwy lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
Jun 21 15:15:34 hwy lightdm: pam_unix(lightdm:session): session opened for user debian8 by (uid=0)
Jun 21 15:15:34 hwy systemd-logind[695]: New session 5 of user debian8.
Jun 21 15:15:34 hwy systemd: pam_unix(systemd-user:session): session opened for user debian8 by (uid=0)
Jun 21 15:15:34 hwy lightdm: pam_unix(lightdm:session): session closed for user debian8
Jun 21 15:15:34 hwy systemd-logind[695]: Removed session 5.
Jun 21 15:15:34 hwy systemd: pam_unix(systemd-user:session): session closed for user debian8
Jun 21 15:15:34 hwy lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Jun 21 15:15:34 hwy systemd-logind[695]: New session c4 of user lightdm.
Jun 21 15:15:37 hwy systemd-logind[695]: Removed session c3.
Jun 21 15:15:42 hwy lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm

So, is /home/debian8 there, could always delete the user and add a new? (I have messed up a password once or (pun (re-enter)) twice? )

I have tried for twice ./home/debian8 is still there, no changes.
Why session closed for user debian8?

I don't think I have ever removed a user? But, backups as usual.

I'd think you canthen move (if any) files from "debian8" and..?

so do you mean: you created a user/password (several times), worked at first but now you can't login
I would increase the log level of pam (or probably check another logfiles too)

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For a "" thread seems you both went over my head quick?

what was the last change you made on your machine?

Did you by any chance change the permission on ./home/debian8?

cat /etc/passwd is debian8 user listed there?

or check out this link: https://bugs.debian.org/cgi-bin/bugr...cgi?bug=541188

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1.The last change on my pc is to execute aria2c command to download torrent ,then i power off my pc.
2.In the afternoon, i find that `debian8` can't login when to reboot my pc ,then i tried with `debian8` twice.

The fact is not that
there is one account name `debian` ,and i add new name as `debian8`, two `debian8` was added twice, no.

Why my os do not assign a session for `debian8`?
From the log info : Jun 21 15:15:34 hwy lightdm: pam_unix(lightdm:session): session closed for user debian8

it was assigned, but also it was closed because of some configuration/permission/whatever issue
That's why you may need to increase log level

ls -ld /home/debian8
drwxr-xr-x 65 debian8 debian8 4096 Jun 21 16:00 /home/debian8

only root can login into my os now.
useradd -d /home/test1 test1
passwd test1

test1 can't login os when logout from root.
Why??

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