I've successfully installed the 15.0 distribution, but, ad the end, I got a unusable system.
Afer reboot, the system shows a Login prompt for which root - with whichever password - is wrong.
I've already repeated the installation 3 time (formatting the root partition every time):
- first time with a commonly used (in my company) password 7 chars long (because is "commonly used", I'm quite sure that I do not make mistakes);
- second time I choose the option to not set the root password: same result;
- third time I choose a longer and complex password (using cut and paste to avoid mistakes) but nothing changed.
Did someone put me in the right direction to solve this? Otherways, this - long awaited - new distribution results unusable

UPDATE
I've booted again from ISO image, mounted the installed Slackaware, created another user (unprivileged) and, with that user, I could log in. And, once logged in, I could su root (both with and without password). I can also change root password and everything works, then only "strange" thing remains the impossibility to log in as root from both the console and via ssh (and, I'm not sure that everyone is able to do the workaround just exposed)

I suspect PAM on this one. There are different PAM requirements for login and su, with the login ones being stricter, and you may have fallen foul of them.

I agree with you Hazel. but don't you think this is a serious bug for this new distribution?
I do not have a physical machine to test the installation, but I suspect that root login after installation is limited to physical console. All the installations of Slackware 15 I've tried today have been done as a VM (under another Linux with KVM, text only mode) and the console is ther serial one (in other words, there is no physical console or equivalent). If my hypothesis is right, at minimun the installation instruction of Slackware 15 needs to be amended to say something like:
"If the installation is done without physical console, at the end of installation, before rebooting installed system, choose 'shell' and create a non priviled user with useradd to be able to login after reboot"
Don't you agree?

Couldn't tell you! I never use virtual machines and know very little about them. But I've just looked up the PAM files in /etc/pam.d and the one for login specifies pam_securetty as "required". That requires a local login by default. The consoles that count as secure are listed in /etc/securetty and the serial ones are all commented out.

Try uncommenting the one you use and perhaps then you can log in as root.

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You're right Hazel, I should have thought about it by myself.
Anyway, now it works and I recommend to put a note in Slackware 15 installation documentation:
"If you install without a physical console, enable the console from which you'll do first login in /etc/securetty before rebooting (for example, for serial console, delete '#' from ttyS0 line in /etc/securetty)"
Great work! Thank you.

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Direct root login via ssh is disabled by default.

To enable it, you need to edit /etc/sshd/sshd_confing by changing the setting "PermitRootLogin" to "yes".

As to your original post, I don't see why you were unable to login as root at the console. Counting both hardware and VMs, I must have completed about 20 full installations of Slackware, and have never not been able to log in as root at the console...

EDIT: just realized that you & hazel figured it out.

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