I have two OS on two different partitions, same computer:
- Ubuntu
- Windows

I use those, relatively the same ammount of time.

I want to run boinc whatever OS I'm using.

Is it possible to run the same task projects? I mean, If I close Boinc on Ubuntu with task X at 60%, load task X on Windows at that 60%.

I tried changing the Ubuntu's Boinc data directory to the Windows one,

# /etc/default/boinc-client
# This is the data directory of the BOINC core client.
# default:
#BOINC_DIR="/var/lib/boinc-client"
# windows one:
BOINC_DIR="/media/jacks/AA481DE5481DB0D5/BOINC"

but it didn't worked at all.

The Boinc Manager (on Ubuntu) appeared completely blank and didn't respond when I tried to connect to a project manager. At the bottom right it says "Connecting to localhost" for a long time, until it changes to "Disconnected".

Any ideas?

What I also do following this thread:

:~$ sudo mv /var/lib/boinc-client/ /var/lib/boinc-client-original/
:~$ sudo mkdir /var/lib/boinc-client/
:~$ sudo mount --bind /media/jacks/AA481DE5481DB0D5/BOINC/ /var/lib/boinc-client/
:~$ sudo /etc/init.d/boinc-client restart

So instead of modifying the config file, I binded the Windows Boinc folder to the Ubuntu's default one.

Didn't work either.

I have two OS on two different partitions, same computer:
- Ubuntu
- Windows

I use those, relatively the same ammount of time.
<snip>

Any ideas?

Any reason why not set up two separate hosts and simply run boinc when each starts?

Project applications are specific to the OS.

As Les already said, either OS uses their own executables. Which details are written into client_state.xml, which can only be written to for one platform. Else they'll probably overwrite each other in that file.

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Any reason why not set up two separate hosts and simply run boinc when each starts?

Very long tasks like the ones from climate prediction and sometimes I use the same OS for days, and I could pass the deadline from some projects in that time.

Project applications are specific to the OS.

As Les already said, either OS uses their own executables. Which details are written into client_state.xml, which can only be written to for one platform. Else they'll probably overwrite each other in that file.

Thank you very much, that makes sense.

It should be possible to run Windows version on Linux using WINE. CPU and OpenCL apps should work fine, CUDA apps probably not and VirtualBox apps unlikely.