Hi @federico.ballarini
I have used NethServer on Arubacloud before, buit their smallest offer of EUR2.37 (ex VAT) is not capable enough to run NethServer comfortably. It has only 1GB ram and only 20GB of diskspace. If youwa nt to use it for Nextcloud, you will run out of diskspace very soon.
As @m.traeumner already mentioned, contabo has a much more affordable plan.
The cheapest offer is EUR3.99 (incl VAT) and then you have 4GB ram and 300GB of SSD boosted diskspace.
Installing NethServer on either Arubacloud or Contabo is possible. Be aware you will onnly have 1 network interface, so you will need to create a dummy interface or use a VLAN to be able to create a RED interface (needed when you go for Samba4 AD account provider) In the wiki there is a howto for the dummy interface, or use the suggestion to create a VLAN by @davidep Create a dummy interface when you only have 1 NIC available
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