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Under my user a hidden system folder .cache/upstart/ is getting insanely large - 99G. This is mainly due to a file gnome-session.log. Does anybody know what this folder is and why it may get so large? Can I safely remove the file?

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up vote 0 down vote accepted

It's just a log, so yes, you can safely remove this file.

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I would also like to understand what is growing so much this file - it seems full of log of this error kbuildsycoca4(21468) KBuildServiceFactory::populateServiceTypes: "/usr/share/applications/shotwell-viewer.desktop" specifies undefined mimetype/servicetype "image/x-mrw" – Luca Fiaschi Mar 2 '14 at 18:12
I don't know, however there is a bug on Launchpad which describe similar situation. Maybe there you will be able to find solution. – kubahaha Mar 2 '14 at 19:51

I had this problem also, gnome-session-Unity.log file was getting large.

Before this I installed the scratch programming environment, this programm has the squeak-vm dependencies also installed 1st time on this machine. The squeak-vm was locked on the launcher, the line in the gnome-session-Unity log file

    (zenity:3190): GLib-WARNING **: /build/buildd/glib2.0-2.40.2/./glib/giounix.c:410Error while getting flags for FD: Bad file descriptor (9) 

this entry was repeated and the file getting bigger.

Also a window from squeak-vm was opened and couldn't normally close that window.

In order to solve the problem I uninstalled the scratch package and the squeak-vm package, close the window from squeak-vm with xkill.

Environment: Ubuntu 14.04 , scratch, squeak-vm 1:, zenity 3.8.0-1ubuntu1

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