Can't upgrade to 14.10 becuase 'ascii' codec

[zayed]

I need your help. It seems there is something wrong with my installation of 14.04. When I try to upgrade to 14.10, I get this:

zayed@zayed-HP-Pavilion:~$ sudo do-release-upgrade -m desktop -f DistUpgradeViewKDE
Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 113, in <module>
    print(_("Checking for a new Ubuntu release"))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-4: ordinal not in range(128)

[Snowhog]

Doing the version upgrade from the command line, use:

sudo do-release-upgrade -d

Before you do however, make sure your system is fully up to date:

sudo apt-get update && sudo apt-get dist-upgrade

[zayed]

Doing the version upgrade from the command line, use:

sudo do-release-upgrade -d

Before you do however, make sure your system is fully up to date:

sudo apt-get update && sudo apt-get dist-upgrade

I did that but without success:

zayed@zayed-HP-Pavilion:~$ sudo do-release-upgrade -d
Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 113, in <module>
    print(_("Checking for a new Ubuntu release"))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-4: ordinal not in range(128)

[Snowhog]

What Country/Language are you using on your Kubuntu?

[zayed]

What Country/Language are you using on your Kubuntu?

Oman/English

However, when I put it USA/English the problem is fixed! Thanks for the hint!