Unfortunately, Launchpad has a bug and therefore attchement links do not get added to the comments in this bug report. Here I add the links of the last postings manually (if a comment not mentioned here does not exist in this bug report, this comment was without text, only with the attachment):

comment #46: "error_log"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3163962/+files/error_log

comment #47: "error_log"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3165268/+files/error_log

comment #60: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3188272/+files/error_log.gz

comment #62: "syslog.1"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3189181/+files/syslog.1

comment #65: "syslog"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190864/+files/syslog

comment #66: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190865/+files/error_log.gz

comment #67: "syslog"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190889/+files/syslog

comment #68: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190890/+files/error_log.gz

comment #69: "syslog"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190899/+files/syslog

comment #70: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190900/+files/error_log.gz

comment #71: "syslog.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190923/+files/syslog.gz

comment #72: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3190924/+files/error_log.gz

comment #77: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3191050/+files/error_log.gz

comment #78: "syslog.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3191051/+files/syslog.gz

comment #82: "log.txt"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3191148/+files/log.txt

comment #88: "error_log.1"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3191422/+files/error_log.1

comment #89: "error_log.2"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3191423/+files/error_log.2

comment #92: "error_log.gz"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3197073/+files/error_log.gz

comment #93: "syslog"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3197074/+files/syslog

comment #101: "cups-error_log.blacklisted-unidir"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3206219/+files/cups-error_log.blacklisted-unidir

comment #105: "cups-error_log.blacklisted-bidir"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3206221/+files/cups-error_log.blacklisted-bidir

comment #106: "error_log"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3206243/+files/error_log

comment #110: "error_log"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/987485/+attachment/3207385/+files/error_log