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Locale or run level - cannot open display message

I try to change locale for a program to run my native language with root. I don't know what I made, but can't open gui programs from konsole with root account. It appear this error:

Code:

root@laptop:/etc/profile.d# mousepad



(process:4284): Gtk-WARNING **: Locale not supported by C library.

        Using the fallback 'C' locale.

No protocol specified



(mousepad:4284): Gtk-WARNING **: cannot open display: :0.0

root@laptop:/etc/profile.d#

When type locale, it appear:

Code:

root@laptop:/etc/profile.d# locale

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_MESSAGES to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

LANG=en_EN

LC_CTYPE="en_EN"

LC_NUMERIC="en_EN"

LC_TIME="en_EN"

LC_COLLATE=C

LC_MONETARY="en_EN"

LC_MESSAGES="en_EN"

LC_PAPER="en_EN"

LC_NAME="en_EN"

LC_ADDRESS="en_EN"

LC_TELEPHONE="en_EN"

LC_MEASUREMENT="en_EN"

LC_IDENTIFICATION="en_EN"

LC_ALL=

root@laptop:/etc/profile.d#

It seems all ok, because I changed LANG with bg_BG, but there is some problem with monitor "(mousepad:4284): Gtk-WARNING **: cannot open display: :0.0"

Yesterday I make run level 4 to skip typing startx in console, and login directly to KDE.

Could be that the problem?

Try, from your own account:

Code:

kdesu mousepad

then enter root's password.
To change locale, edit /etc/profile.d/lang.sh
change en_US

Code:

export LANG=en_US

to whatever you want.

I want to run gui programs from konsole, as before. I don't know what I do, but can't run mousepad directly with root account. Something messed up. In lang.sh everything seems ok.

How can I fix "Using the fallback 'C' locale." Which locale should I change to what?

I actually found a solution at (the first post of Nikos_M)

http://ubuntuforums.org/archive/index.php/t-166863.html

but after restating it happen again

The error is

Invalid MIT-MAGIC-COOKIE-1 key
(mousepad:3943): Gtk-WARNING **: cannot open display: :0.0

Can I delete that key and make it again or something ?

Are you logging in as root, then trying kdesu? Log in as your regular user to use kdesu mousepad (or whatever GUI).

I log in as user and then su and pass to log in as root to make install or something else. I was able before to mousepad from root account, but after make some locale changes this error appear. I didn't make an image (but I have to) of the previous condition and I now I want to get back as before was.