Comment 4 for bug 1330542

Hello and thank you for your bug report! What versions of php-pear and Ubuntu are we discussing here?

Precise:

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.5 LTS"
# apt-cache policy php-pear
php-pear:
  Installed: 5.3.10-1ubuntu3.21
  Candidate: 5.3.10-1ubuntu3.21
  Version table:
 *** 5.3.10-1ubuntu3.21 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.3.10-1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
# pear list-channels
Registered Channels:
====================
Channel Alias Summary
doc.php.net phpdocs PHP Documentation Team
pear.php.net pear PHP Extension and Application
                     Repository
pecl.php.net pecl PHP Extension Community Library
__uri __uri Pseudo-channel for static packages
# pear install foo
No releases available for package "pear.php.net/foo"
install failed

Trusty:

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS"
# apt-cache policy php-pear
php-pear:
  Installed: 5.5.9+dfsg-1ubuntu4.14
  Candidate: 5.5.9+dfsg-1ubuntu4.14
  Version table:
 *** 5.5.9+dfsg-1ubuntu4.14 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.5.9+dfsg-1ubuntu4 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
# pear list-channels
Registered Channels:
====================
Channel Alias Summary
doc.php.net phpdocs PHP Documentation Team
pear.php.net pear PHP Extension and Application
                     Repository
pecl.php.net pecl PHP Extension Community Library
__uri __uri Pseudo-channel for static packages
# pear install foo
No releases available for package "pear.php.net/foo"
install failed

Vivid:

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.04
DISTRIB_CODENAME=vivid
DISTRIB_DESCRIPTION="Ubuntu 15.04"
# apt-cache policy php-pear
php-pear:
  Installed: 5.6.4+dfsg-4ubuntu6.4
  Candidate: 5.6.4+dfsg-4ubuntu6.4
  Version table:
 *** 5.6.4+dfsg-4ubuntu6.4 0
        500 http://archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.6.4+dfsg-4ubuntu6 0
        500 http://archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
# pear list-channels
Registered Channels:
====================
Channel Alias Summary
doc.php.net phpdocs PHP Documentation Team
pear.php.net pear PHP Extension and Application
                     Repository
pecl.php.net pecl PHP Extension Community Library
__uri __uri Pseudo-channel for static packages
# pear install foo
No releases available for package "pear.php.net/foo"
install failed

Wily:

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.10
DISTRIB_CODENAME=wily
DISTRIB_DESCRIPTION="Ubuntu 15.10"
# apt-cache policy php-pear
php-pear:
  Installed: 5.6.11+dfsg-1ubuntu3.1
  Candidate: 5.6.11+dfsg-1ubuntu3.1
  Version table:
 *** 5.6.11+dfsg-1ubuntu3.1 0
        500 http://archive.ubuntu.com/ubuntu/ wily-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ wily-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.6.11+dfsg-1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
# pear list-channels
Registered Channels:
====================
Channel Alias Summary
doc.php.net phpdocs PHP Documentation Team
pear.php.net pear PHP Extension and Application
                     Repository
pecl.php.net pecl PHP Extension Community Library
__uri __uri Pseudo-channel for static packages
# pear install foo
No releases available for package "pear.php.net/foo"
install failed

Xenial:

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu Xenial Xerus (development branch)"
# apt-cache policy php-pear
php-pear:
  Installed: 1:1.10.1+submodules+notgz-6
  Candidate: 1:1.10.1+submodules+notgz-6
  Version table:
 *** 1:1.10.1+submodules+notgz-6 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
# pear list-channels
Registered Channels:
====================
Channel Alias Summary
doc.php.net phpdocs PHP Documentation Team
pear.php.net pear PHP Extension and Application
                     Repository
pecl.php.net pecl PHP Extension Community Library
__uri __uri Pseudo-channel for static packages
# pear install foo
No releases available for package "pear.php.net/foo"
install failed

In all but Xenial, `pear install Archive_Tar` completed successfully.