''Creates the working directory /var/lib/boinc-client/ for BOINC data files and the slots and projects directories. Also creates links from this directory to the files in /etc/boinc-client''

I'm on Linux Ubuntu 18.04 and have a SSD where Boinc is installed from software center, of 32 GB.
/ partition is not enought for LHC. Keep getting messages like you need more 1200 MB of space to run ALTLAs and other projects form LHC.
Yesterday I seen a documentary about first second after BIG BANG -- with the colider from Europe -- Higs -- and realy want to paticipate.
I've tracked projects folder in var/lib/boinc-client/ but don't know how to set download folder on second HDD for LHC and create link to boinc.
In conclusion I want the rest of projects and BOINC on SSD (it's new -- no bad sectors) and LHC on HDD.
Please teach me HOW TO.
Thank you.

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What are your preferences set to?
Best post the contents of your global_prefs.xml and if it exists, the global_prefs_override.xml files.

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In conclusion I want the rest of projects and BOINC on SSD (it's new -- no bad sectors) and LHC on HDD.

Putting one project on this disk and another project on that disk is something that can't really be done.

The only way I know to do it is to run a second instance of BOINC, only attached to LHC, and give that second instance a separate data folder on the HDD via the command line. It's a solution which is documented and has been discussed on these boards periodically, but it isn't trivial to set up.