Leí las otras preguntas de instalación de PHPUnit pero no he tenido éxito. ¿Qué está pasando con mi instalación PEAR?

$ sudo pear update-channels
Updating channel "components.ez.no"
Channel "components.ez.no" is up to date
Updating channel "doc.php.net"
Channel "doc.php.net" is up to date
Updating channel "pear.php.net"
Channel "pear.php.net" is up to date
Updating channel "pear.phpunit.de"
Channel "pear.phpunit.de" is up to date
Updating channel "pear.symfony-project.com"
Channel "pear.symfony-project.com" is up to date
Updating channel "pecl.php.net"
Channel "pecl.php.net" is up to date
$ sudo pear upgrade pear
Nothing to upgrade
$ sudo pear install phpunit/PHPUnit
phpunit/PHPUnit requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/PHPUnit can optionally use PHP extension "dbus"
phpunit/DbUnit requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/File_Iterator requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires package "phpunit/File_Iterator" (version >= 1.2.2)
phpunit/PHP_CodeCoverage can optionally use PHP extension "xdebug" (version >= 2.0.5)
phpunit/PHPUnit_MockObject requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/PHPUnit_Selenium requires PEAR Installer (version >= 1.9.2), installed version is 1.9.0
phpunit/PHP_TokenStream requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
No valid packages found
install failed
$ pear list
Installed packages, channel pear.php.net:
=========================================
Package          Version  State
Archive_Tar      1.3.7    stable
Cache_Lite       1.7.11   stable
Console_Getopt   1.3.1    stable
HTTP_Request2    2.0.0RC1 beta
Net_URL2         0.3.1    beta
PEAR             1.9.3    stable
Structures_Graph 1.0.4    stable
XML_RPC2         1.1.1    stable
XML_Util         1.2.1    stable
greg@ubuntu:~$ pear -V
PEAR Version: 1.9.0
PHP Version: 5.3.6
Zend Engine Version: 2.3.0
Running on: Linux ubuntu 2.6.32-32-generic-pae #62-Ubuntu SMP Wed Apr 20 22:10:33 UTC 2011 i686

pear list informa 1.9.3 instalado,pear -V informa 1.9.0!?!

Actualiza Intenté la sugerencia de KingCrunch.

$ sudo pear install -f pear
[sudo] password for greg: 
downloading PEAR-1.9.3.tgz ...
Starting to download PEAR-1.9.3.tgz (295,774 bytes)
...........................done: 295,774 bytes
install ok: channel://pear.php.net/PEAR-1.9.3
PEAR: Optional feature webinstaller available (PEAR's web-based installer)
PEAR: Optional feature gtkinstaller available (PEAR's PHP-GTK-based installer)
PEAR: Optional feature gtk2installer available (PEAR's PHP-GTK2-based installer)
PEAR: To install optional features use "pear install pear/PEAR#featurename"
$ pear -V
PEAR Version: 1.9.0
PHP Version: 5.3.6
Zend Engine Version: 2.3.0
Running on: Linux ubuntu 2.6.32-32-generic-pae #62-Ubuntu SMP Wed Apr 20 22:10:33 UTC 2011 i686