31 branches? uh… okay.

It’s in their docs. https://docs.nextcloud.com/server/latest/admin_manual/installation/index.html

Follow the pages one by one, (ie install php modules etc, edit settings, install apache2, edit settings, etc etc). Follow the recommendations (eg. PHP8.2, don’t try to use bleeding edge).

You’ll be running in no time, and have a properly updatable system using apt, and the nextcloud ./occ command.

I would recommend using Debian 12 over Ubuntu variants. There are other guides, like this: https://www.digitalocean.com/community/tutorial-collections/how-to-install-and-configure-nextcloud But you may have to “convert” some of the Ubuntu specific stuff to Debian, but actually there is probably no difference (php module naming convention maybe? Is that still a problem today?)

Heimdall

https://youtu.be/GXnnMAxPzMc

Thats not how it works.

You have a LAN and hopefully you have a firewall that shields your LAN from WAN. Your fw is probably handing out DHCP lease IP (like 192.168.x.y)

When you “bridge” your VM looks like an independant device on you LAN. Nothing at this point has allowed it to the public. Your dhcp can even give it an IP (but its probably better to set a static ip). In bridge mode, a "fake mac is spoofed alongside you nic’s real mac, and only for said VM)

At that point the VM id accessible likr any other device on the LAN.

if you then want to use vpn, just connect to your LAN however that works(vpn to computer or vpn to firewall/vpn server) and access.

if you want to access from WAN without vpn, then you need to understand reverse proxying and youll need a full proper firewall\gateway device at the front of your network (like OPNsense).

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ClamAV and ClamWin (frontend for windows) are FOSS software, however do note that Clam does not offer real-time protection. For Linux it does offer On-Access scanning, this additionally needs to be setup. I am unaware if the current Windows version(s) has changed this.