[horde] Upgrade via PEAR not succeeding

[straube at 4magic.de]

Hi there guys,

we've got a little problem while upgrading our Horde installation from  
4.x to 5.x.
Seemingly PEAR cannot resolve some of the dependencies.

I'm using this command to start the upgrade:
root at 4m-WebSrv-80:/var/www# pear upgrade -a -B -c horde

Horde resides in /var/www/horde/.

This is the output the command produces:

=============================================================

WARNING: "pear/Console_Getopt" is deprecated in favor of  
"pear/Console_GetoptPlus"
WARNING: "pear/HTTP_Request" is deprecated in favor of "pear/HTTP_Request2"
Unknown remote channel: pear.symfony.com
horde/whups is not compatible with downloaded package  
"horde/Horde_Group" version 2.0.0
horde/ansel requires package "horde/Horde_Group" (version >= 1.0.0,  
version <= 2.0.0alpha1, excluded versions: 2.0.0alpha1), downloaded  
version is 2.0.0
horde/Horde_Group cannot be installed, conflicts with installed packages
horde/gollem is not compatible with downloaded package  
"horde/Horde_Serialize" version 2.0.0
horde/ansel requires package "horde/Horde_Serialize" (version >=  
1.0.0, version <= 2.0.0alpha1, excluded versions: 2.0.0alpha1),  
downloaded version is 2.0.0
horde/Horde_Serialize cannot be installed, conflicts with installed packages
horde/ansel requires package "horde/Horde_Nls" (version >= 1.0.0,  
version <= 2.0.0alpha1, excluded versions: 2.0.0alpha1), downloaded  
version is 2.0.1
horde/Horde_Nls cannot be installed, conflicts with installed packages
horde/Horde_Kolab_Server can optionally use PHP extension "ldap"beta1,  
version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1), installed  
version is 1.0.5

horde/nag requires package "horde/Horde_Icalendar" (version >= 1.0.0,  
version <= 2.0.0, excluded versions: 2.0.0), downloaded version is 2.0.1
horde/Horde_Http can optionally use PHP extension "curl"h installed packages
horde/Horde_Http can optionally use PHP extension "http"

horde/Horde_Itip requires package "horde/Horde_Icalendar" (version >=  
2.0.0, version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1),  
installed version is 1.1.2
horde/Horde_Data cannot be installed, conflicts with installed  
packagesn <= 2.0.0, excluded versions: 2.0.0), downloaded version is  
2.0.1
horde/nag is not compatible with downloaded package "horde/Horde_View"  
version 2.0.0

[.............]

horde/Horde_ListHeaders requires package "horde/Horde_Mail" (version  
 >= 2.0.0, version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1),  
installed version is 1.2.0
horde/Horde_ElasticSearch requires package "horde/Horde_Exception"  
(version >= 2.0.0, version <= 3.0.0alpha1, excluded versions:  
3.0.0alpha1), installed version is 1.0.9
horde/Horde_ElasticSearch requires package "horde/Horde_Http" (version  
 >= 2.0.0, version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1),  
installed version is 1.1.1

phpunit/PHPUnit requires package "channel://pear.symfony.com/Yaml"  
(version >= 2.1.0)
No valid packages foundequires package "phpunit/PHPUnit" (version >= 3.6.0RC1)
upgrade failed

=============================================================

I omitted some lines of the output as they are mostly dependency  
issues in the same scheme as the others I quoted.

We are running on Ubuntu 12.04 Server amd64 on a virtualized KVM setup.

I'd be very grateful if you could help.

Regards,
Thomas