I have started to traverse through instructions on KVM installation without realising that I was not SSHing to my server and performing everything on my local machine. I have got as fas as installing the following

sudo apt install qemu qemu-kvm libvirt-bin  bridge-utils  virt-manager


sudo apt install netplan

After purging and auto removing I have ended up with a non functional network.

lshw -C network 

shows my adapter as disabled. After ifconfig up enp3s0 it appears in if config but still not functional. I have tried various configurations. The outcome is that /etc/network/interfaces is completely ignored by the system because of parameter in NetworkManager.conf. When I set managed= false, the interface obtains some strange ipv6 address, but not ipv4 in both static and DHCP configurations. Configuring via GUI did not lead to any significant result.

I would really appreciate any advice on this, because the only solution for me now is the full system re-installation, which is not really optimal by any means

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