Bad things happened, my fiber internet disconnected for several days and I had to use tethering. Unfortunately, my vagrant's virtual box network connection became very slow.
config.vm.provider "virtualbox" do |vb|
...
vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
...
end
Adding natdnshostresolver1 and natdnsproxy1 fixed the issue.