Comment 5 for bug 1492767

Maybe it's not related... but I prefer to register here.

I use Trusty for some months (3,4...) and the last one or two dist-upgrades just got me out of my Unity Desktop. GUI login did not complete (always back to login), default wallpaper not shown, topbar not shown (icons, etc). Only console saved me (Ctrl-Alt-F1).

I noticed the same info about Gdkpixbuf loader module in the bug description. Also gdk-pixbuf-query-loaders was not installed. But I just did not worry about these messages. On next boot the problem aroused.

I analysed apt log file and isolated last two dist-upgrades (below). I decided to downgrade the first ones and I regained login to desktop. Now you see the words GDK and PIXBUF:

gir1.2-gdkpixbuf-2.0:amd64 (2.30.7-0ubuntu1.2, 2.30.7-0ubuntu1.6)
libgdk-pixbuf2.0-common:amd64 (2.30.7-0ubuntu1.2, 2.30.7-0ubuntu1.6)
libgdk-pixbuf2.0-0:amd64 (2.30.7-0ubuntu1.2, 2.30.7-0ubuntu1.6)
libgdk-pixbuf2.0-0:i386 (2.30.7-0ubuntu1.2, 2.30.7-0ubuntu1.6)
openssl:amd64 (1.0.1f-1ubuntu2.19, 1.0.1f-1ubuntu2.20)
libssl1.0.0:amd64 (1.0.1f-1ubuntu2.19, 1.0.1f-1ubuntu2.20)

linux-image-4.4.0-38-generic:amd64 (4.4.0-38.57~14.04.1, automatic)
linux-headers-4.4.0-38:amd64 (4.4.0-38.57~14.04.1, automatic)
linux-image-extra-4.4.0-38-generic:amd64 (4.4.0-38.57~14.04.1, automatic)
linux-headers-4.4.0-38-generic:amd64 (4.4.0-38.57~14.04.1, automatic)
linux-generic-lts-xenial:amd64 (4.4.0.36.26, 4.4.0.38.28)
libservlet3.0-java:amd64 (7.0.52-1ubuntu0.6, 7.0.52-1ubuntu0.7)
linux-headers-generic-lts-xenial:amd64 (4.4.0.36.26, 4.4.0.38.28)
linux-image-generic-lts-xenial:amd64 (4.4.0.36.26, 4.4.0.38.28)
linux-libc-dev:amd64 (3.13.0-95.142, 3.13.0-96.143)
firefox-locale-en:amd64 (48.0+build2-0ubuntu0.14.04.1, 49.0+build4-0ubuntu0.14.04.1)
python3.4:amd64 (3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4)
dkms:amd64 (2.2.0.3-1.1ubuntu5.14.04.7, 2.2.0.3-1.1ubuntu5.14.04.8)
thunderbird-locale-en-us:amd64 (45.2.0+build1-0ubuntu0.14.04.3, 45.3.0+build1-0ubuntu0.14.04.4)
firefox:amd64 (48.0+build2-0ubuntu0.14.04.1, 49.0+build4-0ubuntu0.14.04.1)
python3.4-minimal:amd64 (3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4)
libpython3.4-stdlib:amd64 (3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4)
libgweather-3-6:amd64 (3.10.2-0ubuntu2, 3.10.2-0ubuntu3)
libpython3.4:amd64 (3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4)
libpython3.4-minimal:amd64 (3.4.3-1ubuntu1~14.04.3, 3.4.3-1ubuntu1~14.04.4)
libgweather-common:amd64 (3.10.2-0ubuntu2, 3.10.2-0ubuntu3)

My Desktop is still buggy at startup (some app crash and I cannot figure out). But at least I can work.

Cheers