Comment 48 for bug 349237

Me too. I'm now getting this message on every login. This must have happened as a result of an update on lucid within the last couple of days. Looking back through dpkg.log, I suspect one of these updates is to blame (perhaps libpng?):

2010-07-12 09:00:57 startup archives unpack
2010-07-12 09:01:04 upgrade libpng12-0 1.2.42-1ubuntu2 1.2.42-1ubuntu2.1
2010-07-12 09:01:04 status half-configured libpng12-0 1.2.42-1ubuntu2
2010-07-12 09:01:04 status unpacked libpng12-0 1.2.42-1ubuntu2
2010-07-12 09:01:04 status half-installed libpng12-0 1.2.42-1ubuntu2
2010-07-12 09:01:04 status triggers-pending doc-base 0.9.5
2010-07-12 09:01:04 status half-installed libpng12-0 1.2.42-1ubuntu2
2010-07-12 09:01:04 status half-installed libpng12-0 1.2.42-1ubuntu2
2010-07-12 09:01:04 status unpacked libpng12-0 1.2.42-1ubuntu2.1
2010-07-12 09:01:04 status unpacked libpng12-0 1.2.42-1ubuntu2.1
2010-07-12 09:01:04 trigproc doc-base 0.9.5 0.9.5
2010-07-12 09:01:04 status half-configured doc-base 0.9.5
2010-07-12 09:01:06 status installed doc-base 0.9.5
2010-07-12 09:01:07 startup packages configure
2010-07-12 09:01:07 configure libpng12-0 1.2.42-1ubuntu2.1 1.2.42-1ubuntu2.1
2010-07-12 09:01:07 status unpacked libpng12-0 1.2.42-1ubuntu2.1
2010-07-12 09:01:07 status half-configured libpng12-0 1.2.42-1ubuntu2.1
2010-07-12 09:01:07 status installed libpng12-0 1.2.42-1ubuntu2.1
2010-07-12 09:01:07 status triggers-pending libc-bin 2.11.1-0ubuntu7.2
2010-07-12 09:01:07 trigproc libc-bin 2.11.1-0ubuntu7.2 2.11.1-0ubuntu7.2
2010-07-12 09:01:07 status half-configured libc-bin 2.11.1-0ubuntu7.2
2010-07-12 09:01:07 status installed libc-bin 2.11.1-0ubuntu7.2

Both indicator-applet and indicator-messages are installed.