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As I do not know who is the culprit: Oracle, Sage or Windows10, I report this problem also here.
Sage Math Forum
and the only way to recover is Off/ON my PC Ctrl alt del is not efficient
***Post moved by the moderator to the appropriate forum category.***
I tried again with a new VM Sage.7.6 and the latest version of VirtualBox. I got the same result, My W10 crashes again. few second after clicking on start button
VirtualBox Graphical User Interface
Version 5.1.18 r114002 (Qt5.6.2)
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The problem comes from VirtualBox and W10 because it is ok with VirtualBox and W7.
Sage7.6.ova is OK also with VMware Workstation 11 and W7 .
tonight I'm gonna Try with
Sage7.6.ova VMware Workstation 11 and W10.
I will keep you informed of the test.
Even if obviously my problem does not interest anyone. ;-)
it is ok with VMware 12 workstation Sage7.6 W10.
so it seems the problem comes from Oracle Virtualbox under W10 OS !
Problem also posted on the sageMath forum
Video of the systematic crash on YouTube
VirtualBox Crash on W10
Oracle Virtualbox Forum
finally its ok I have installed Linux Ubuntu 17.04 in dual boot mode .
somebody abelthorne (god bless him !!!)from Ubuntu Guide me to install Sagemath on Ubuntu. And I can now enjoy this wonderful and powerfull software.
see topic here
Ooops, Ooops, Ooops !!!
I'm ashamed of not thinking about it earlier!
It was simply enough to increase the size of the Ram (in Virtualbox Setting menu)for the VM !.
this setting below to enable copy paste text between VM <--> host
setting the keyboard for your country:
open linux terminal window , see image below click on new and choose terminal, you close the sage window by clicking on the icon Jupyter:
sudo nano /etc/sysconfig/keyboard
reboot (To be taken into account)
I set it to 2 Giga byte, and I also pass the number of processor to 2.
and now it is OK for W10 Virtualbox and sageMath7.6.ova !