Cannot install printers

[marvin_ita]

Anyone have problems installing printers?
I cannot install any printer since I get errors about cups. I use KDE and if I go to KDE system settings, printers and I click on "add new printer" it asks username and password (root) then it says "cups-deviced exeution failed".
If I try to open in a browser 127.0.0.1:631 I can see cups homepage, but when I try to go into any menu (printers, jobs, admin) cups server shows a page with a generic "not found"...
If I check cups service it says is running:

# systemctl list-units | grep cups
cups.path                                                                                             loaded active waiting       CUPS Printer Service Spool
cups.service                                                                                          loaded active running       CUPS Printing Service
cups.socket                                                                                           loaded active running       CUPS Printing Service Sockets

Any idea?

[DBelton]

I had to open a terminal window and sign in as root user (su -), then run system-config-printer as root user to be able to add a printer.

Using sudo or running it as an admin user wouldn't work to initially add the printer.

But my last install of F18, I still couldn't get a printer added correctly. system-config-printer would hang when I went to change the printer driver. There was an update to system-config-printer a few days ago, but I haven't tired adding a printer since the update, so maybae that issue was fixed.

[marvin_ita]

Well, I realized what the problem is...

A few days ago I gave an erroneous command from cli: instead of 'chmod -R 777 usr/' I did 'chmod -R 777 /usr'
I soon realize the error and stopped the command with ctrl-c, but seems for some files was too late.

I had to reinstall filesystem, cups, cups-libs to have print system working: now I just power on the printer and it gets installed automatically. (I had some more issues with other things and I had to reinstall some other packages, but seems my system is stable again now).