How to open jupyter in virtualbox from shared folder?

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(Inspired by https://wiki.sagemath.org/SageApplian...):

1. Log into the virtual machine as user sage. For example, you can log into the virtual machine from the text-mode console: Press Right-Ctrl and F1 for a different tty. The user account running the web browser is called sage with password sage. See the advanced options section for more details.

2. Edit the sage user's .xinitrc file:

sagevm login: sage
Password:
Last login: Tue Jul 12 13:32:39 on tty9
[sage@sagevm ~]# nano .xinitrc

1. Modify .xinitrc by adding the following line, just before the last line that starts google-chrome:

cd /media/sf_sage_local/jupyter

assuming that your shared folder is sage_local with a sub-folder jupyter.