I have the same situation, with 251-5, but on a system where I'm only logged in as a user (all user accounts are stored in LDAP). Now I cannot even get a root shell to fix the situation, since 'su' and 'sudo' don't work!
'su' just hangs interminably, until I press Ctrl-C. 'sudo' says: /$ sudo apt-get install libnss-ldap/testing sudo: uid 1000 does not exist in the passwd file! /$ sendmail: ldap-nss.c:1312: do_init: Assertion `cfg->ldc_uris[__session.ls_current_uri] != ((void *)0)' failed. I should add that I actually misconfigured it, since on upgrading libnss-ldap it asked me about which user to bind to the LDAP server as, and I accidentally entered an invalid account name. (Previously it was using anonymous bind, and I had forgotten this.) This is a remote system, and I cannot even log in with SSH, so it's entirely unusable now. Any ideas on how to proceed? Marcus -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]