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I have three Dropbox instances set up to run simultaneously on my Ubuntu 12.04 system. The two additional instances are called by a shell script with the following code (as showed on numerous blogs):

HOME=$HOME/.alt-dropbox /home/me/.dropbox-dist/dropbox start -i

I then set these scripts as start-up applications. This works fine 90% of the times (with three little boxes in my meny bar and everything). But every once in a while, when I re-boot my machine, one of the Dropbox instances is missing. When I type ps -e | grep 'dropbox' only two instances are there (plus the script corresponding to the one additional instance that is running).

When I try to start to start the missing script mannually, I get the following error message:

Another instance of dropbox (1234) is running!

My question is:

Why does it work most of the times, but not always? Why is it a problem that another instance is running for the second additional instance, but not for the first one?

This seems to be a Dropbox problem rather than a start-up application problem, since I can't manually start the application.

Has this happened to anyone else?

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Maybe one of your folders lays on another partition? There are two ways of mounting a partition at startup. Perhaps you mount this one as a "startup-application", not a permanent one. This would mean, that Dropbox client searches for a partition, which is still being mounted and stops. –  kleinempfaenger Aug 2 '13 at 15:04
I suspected something similar, but then why doesn't it let me run the script manually afterwards either (that's when I get the aforementioned error)? –  user2426172 Aug 2 '13 at 21:50
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