По файлам конфликтуют пакеты: pear-core и pear-Mail
[root@www httpd2]# apt-get install pear-Mail
Reading Package Lists... Done
Building Dependency Tree... Done
The following NEW packages will be installed:
  pear-Mail
0 upgraded, 1 newly installed, 0 removed and 0 not upgraded.
Need to get 26.8kB of archives.
After unpacking 102kB of additional disk space will be used.
Get:1 ftp://server.diya.org noarch/classic pear-Mail 1.1.14-alt1 [26.8kB]
Fetched 26.8kB in 0s (145kB/s)
Committing changes...
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file /usr/share/php/pear/.channels/__uri.reg from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.channels/pear.php.net.reg from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.channels/pecl.php.net.reg from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.depdb from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.depdblock from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.filemap from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
file /usr/share/php/pear/.lock from install of pear-Mail-1.1.14-alt1 conflicts with file from package pear-core-1.7.1-alt1
E: Error while running transaction