Whi is debian 9 ignoring my interfaces?

[SystemUser]

Hi!

I ran

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apt-get purge network-manager
update-rc.d -f dhcpd remove

I put the following in /etc/network/interfaces

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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 192.168.1.192
    netmask 255.255.255.0
    gateway 192.168.1.1

Now the problem I have is that ifconfig is now showing me eth0. Why? I also tried manually run ifup eth0 and it said

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Cannot find device "eth0"
Failed to get interface index: No such device

I then found that there is /etc/network/interfaces.d/setup that only described lo. But it didnt help.

Any ideas how to make debian use /etc/interfaces?

ifconfig -a shows me this:

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root@debian-test:~# ifconfig -a
enp0s3: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 08:00:27:b3:47:50  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[Head_on_a_Stick]

https://www.debian.org/releases/stable/ ... face-names

See also http://forums.debian.net/viewtopic.php?f=30&t=47078

[Bulkley]

When you purged network-manager what else did it remove? Do you still have wpa-supplicant?

[SystemUser]

Tnx. enp0s3 helped me.

When you purged network-manager what else did it remove? Do you still have wpa-supplicant?

No, I dont. But now it already works.