Locale not supported problem

Question

Hi, I´m an Italian Ubuntu user who is trying to feel new experiences with awesome distros
I´ve got a problem when trying to run archibald:
# ./archibald
(gksu:3489): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
I´ve already read other posts that explain how to fix this problem, but it didn´t work for me.
My locale -a output:
# locale -a
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
C
POSIX
en_IE
en_IE.iso88591
en_IE.iso885915@euro
en_IE.utf8
en_IE@euro
en_US
en_US.iso88591
en_US.utf8
it_CH
it_CH.iso88591
it_CH.utf8
it_IT
it_IT.iso88591
it_IT.iso885915@euro
it_IT.utf8
it_IT@euro
italian
As you see, I tried to install all English and all Italian locales, but the error remains
Could someone help me, please?

Answer 1

# 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=it_IT@EURO
LC_CTYPE="it_IT@EURO"
LC_NUMERIC="it_IT@EURO"
LC_TIME="it_IT@EURO"
LC_COLLATE=C
LC_MONETARY="it_IT@EURO"
LC_MESSAGES="it_IT@EURO"
LC_PAPER="it_IT@EURO"
LC_NAME="it_IT@EURO"
LC_ADDRESS="it_IT@EURO"
LC_TELEPHONE="it_IT@EURO"
LC_MEASUREMENT="it_IT@EURO"
LC_IDENTIFICATION="it_IT@EURO"
LC_ALL=
Thanks!