Danke für die Tipps.
bettina@bettipc:~$ su root
Passwort:
root@bettipc:/home/bettina# 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: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:24:54:ea:1b:9b brd ff:ff:ff:ff:ff:ff
inet 192.168.0.18/24 brd 192.168.0.255 scope global dynamic noprefixroute enp4s0
valid_lft 2106sec preferred_lft 2106sec
inet6 2001:4dd5:69b9:0:4036:90a7:ece7:f338/64 scope global temporary dynamic
valid_lft 3598sec preferred_lft 3598sec
inet6 2001:4dd5:69b9:0:224:54ff:feea:1b9b/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 3598sec preferred_lft 3598sec
inet6 fe80::224:54ff:feea:1b9b/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: wlp6s0b1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether f2:0c:68:ed:3c:44 brd ff:ff:ff:ff:ff:ff
root@bettipc:/home/bettina# lspci -nnk | grep net -i -A 2
04:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller [11ab:4354]
Subsystem: Samsung Electronics Co Ltd 88E8040 PCI-E Fast Ethernet Controller [144d:c571]
Kernel driver in use: sky2
Kernel modules: sky2
06:00.0 Network controller [0280]: Broadcom Limited BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
Subsystem: Wistron NeWeb Corp. BCM4313 802.11bgn Wireless Network Adapter [185f:051a]
Kernel driver in use: bcma-pci-bridge
Kernel modules: bcma
root@bettipc:/home/bettina# journalctl -b | grep firmware
Dez 13 23:12:17 bettipc kernel: psmouse serio1: elantech: assuming hardware version 2 (with firmware version 0x040215)
Dez 13 23:12:32 bettipc NetworkManager[449]: <info> [1576275152.9697] manager[0x55ef4b5fa030]: monitoring kernel firmware directory '/lib/firmware'.
Dez 13 23:12:36 bettipc kernel: brcmsmac bcma0:1: firmware: failed to load brcm/bcm43xx-0.fw (-2)
Dez 13 23:12:36 bettipc kernel: firmware_class: See
https://wiki.debian.org/Firmware for information about missing firmware
Dez 13 23:12:36 bettipc kernel: brcmsmac bcma0:1: Direct firmware load for brcm/bcm43xx-0.fw failed with error -2
Dez 13 23:12:36 bettipc kernel: brcmsmac bcma0:1: firmware: failed to load brcm/bcm43xx-0.fw (-2)
Dez 13 23:12:36 bettipc kernel: brcmsmac bcma0:1: Direct firmware load for brcm/bcm43xx-0.fw failed with error -2
Dez 13 23:12:36 bettipc NetworkManager[449]: <warn> [1576275156.8073] device (wlp6s0b1): firmware may be missing.
Dez 13 23:22:54 bettipc gnome-software[1072]: failed to convert URL to GsApp: no application was created for running url-to-app with refine-flags=require-license,require-url,require-size,require-version,require-history,require-setup-action,require-origin,require-related,require-menu-path,require-allow-packages,require-provenance,require-icon,require-permissions,require-origin-hostname,require-runtime,require-screenshots with timeout=60 with search=file:///tmp/mozilla_bettina0/firmware-linux_20190114-2_all.deb on plugin=appstream took 55ms
Dez 13 23:25:06 bettipc gnome-software[1072]: failed to convert URL to GsApp: no application was created for running url-to-app with refine-flags=require-license,require-url,require-size,require-version,require-history,require-setup-action,require-origin,require-related,require-menu-path,require-allow-packages,require-provenance,require-icon,require-permissions,require-origin-hostname,require-runtime,require-screenshots with timeout=60 with search=file:///tmp/mozilla_bettina0/firmware-linux-nonfree_20190114-2_all.deb on plugin=appstream
Dez 13 23:32:13 bettipc gnome-software[1072]: failed to convert URL to GsApp: no application was created for running url-to-app with refine-flags=require-license,require-url,require-size,require-version,require-history,require-setup-action,require-origin,require-related,require-menu-path,require-allow-packages,require-provenance,require-icon,require-permissions,require-origin-hostname,require-runtime,require-screenshots with timeout=60 with search=file:///tmp/mozilla_bettina0/firmware-linux_20190114-2_all-1.deb on plugin=appstream
root@bettipc:/home/bettina#
> >/root/wpa.conf
