According to my system, the file /usr/lib/squid/ldap_auth expects libldap_r-2.4.so.2 and liblber-2.4.so.2. Are you using a squid other than that packaged in Ubuntu?
According to my system, the file /usr/lib/ squid/ldap_ auth expects libldap_r-2.4.so.2 and liblber-2.4.so.2. Are you using a squid other than that packaged in Ubuntu?