I tried an usb WiFi stick and with this it is working.
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 30:5a:3a:b2:28:2a brd ff:ff:ff:ff:ff:ff
4: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether f4:ec:38:90:e7:be brd ff:ff:ff:ff:ff:ff
inet 192.168.1.19/24 brd 192.168.1.255 scope global noprefixroute dynamic wlan0
valid_lft 86396sec preferred_lft 86396sec
inet6 2001:4c4e:20c7:1f3d:709b:6be9:1900:27a0/64 scope global temporary dynamic
valid_lft 604796sec preferred_lft 85838sec
inet6 2001:4c4e:20c7:1f3d:924f:1d45:9a84:52e1/64 scope global mngtmpaddr noprefixroute dynamic
valid_lft 604796sec preferred_lft 86396sec
inet6 fe80::5b09:7871:e4f7:4b57/64 scope link noprefixroute
valid_lft forever preferred_lft forever
But it won’t resolve my problem… I don’t want to use a usb stick.