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The wiki says:
# chown -R gvm:gvm /var/lib/openvas
[gvm]$ greenbone-nvt-sync && openvas --update-vt-info
The latter does that mean I need to switch to gvm user while in postgres? also they're asking for a password
I use the blackarch repo
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blackarch isn't supported here, so you'll have to reproduce the "asking for a password" question on an Arch install and give us the full error.
As for the Wiki nomenclature: # means run as root and $ run as non-root, so `[gvm]$` means run as the gvm user. You should be using a Privilege escalation tool to become those users, for example: `sudo -iu postgres` and `sudo -iu gvm`. It's typically easier to first become root (sudo -i) and then become postgres/gvm (use `exit` to return to root in between) to avoid password prompts for those users, but that all depends on your sudoers setup and if you're even using sudo in the first place as your escalation tool.
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