diff -uNr bzr-2.5.1.old/bzrlib/transport/http/_urllib2_wrappers.py bzr-2.5.1/bzrlib/transport/http/_urllib2_wrappers.py
--- bzr-2.5.1.old/bzrlib/transport/http/_urllib2_wrappers.py	2012-05-22 17:10:04.000000000 +0200
+++ bzr-2.5.1/bzrlib/transport/http/_urllib2_wrappers.py	2012-06-06 12:44:17.028256769 +0200
@@ -85,6 +85,7 @@
     u"/usr/local/share/certs/ca-root-nss.crt", # FreeBSD
     # XXX: Needs checking, can't trust the interweb ;) -- vila 2012-01-25
     u'/etc/openssl/certs/ca-certificates.crt', # Solaris
+    u'/etc/certs/ca-certificates.crt', # PLD Linux
     ]
 def default_ca_certs():
     if sys.platform == 'win32':