Ошибка при установке любого программного обеспечения или обновлении в Ubuntu 12.04

Во время установки чего-либо или обновления я получаю эту ошибку "Установка или удаление программного пакета не удалась". и детали ниже:

installArchives() failed: perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "en_IN.ISO8859-1"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
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
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "en_IN.ISO8859-1"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
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
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "en_IN.ISO8859-1"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
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
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "en_IN.ISO8859-1"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
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
(Reading database ... 
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(Reading database ... 445343 files and directories currently installed.)
Preparing to replace qbittorrent 3.1.x-0~4612-20131231~ubuntu12.04.1 (using .../qbittorrent_3.1.x-0~4619-20140103~ubuntu12.04.1_i386.deb) ...
Unpacking replacement qbittorrent ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for menu ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for man-db ...
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
Setting up isc-dhcp-server (4.1.ESV-R4-0ubuntu5.9) ...
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
/var/lib/dpkg/info/isc-dhcp-server.config: 10: /etc/default/isc-dhcp-server: Separate: not found
dpkg: error processing isc-dhcp-server (--configure):
 subprocess installed post-installation script returned error exit status 127
No apport report written because MaxReports is reached already
dpkg: dependency problems prevent configuration of dhcp3-server:
 dhcp3-server depends on isc-dhcp-server; however:
  Package isc-dhcp-server is not configured yet.
dpkg: error processing dhcp3-server (--configure):
 dependency problems - leaving unconfigured
Setting up qbittorrent (3.1.x-0~4619-20140103~ubuntu12.04.1) ...No apport report written because MaxReports is reached already

Processing triggers for menu ...
Errors were encountered while processing:
 isc-dhcp-server
 dhcp3-server
Error in function: 
Setting up isc-dhcp-server (4.1.ESV-R4-0ubuntu5.9) ...
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
/var/lib/dpkg/info/isc-dhcp-server.config: 10: /etc/default/isc-dhcp-server: Separate: not found
dpkg: error processing isc-dhcp-server (--configure):
 subprocess installed post-installation script returned error exit status 127
dpkg: dependency problems prevent configuration of dhcp3-server:
 dhcp3-server depends on isc-dhcp-server; however:
  Package isc-dhcp-server is not configured yet.
dpkg: error processing dhcp3-server (--configure):
 dependency problems - leaving unconfigured

в то время как в действительности программное обеспечение устанавливается, но выдает вышеуказанную ошибку. Я использую Ubuntu 12.04 с оболочкой GNOME.