client-linux-wireguard.md: add nscd to packages

nscd or unbound are needed to be present on the system or the following error happens:

$ sudo systemctl start wg-quick@wg0
Job for wg-quick@wg0.service failed because the control process exited with error code. See "systemctl status wg-quick@wg0.service" and "journalctl -xe" for details.

$ sudo systemctl status wg-quick@wg0                                     
● wg-quick@wg0.service - WireGuard via wg-quick(8) for wg0
   Loaded: loaded (/lib/systemd/system/wg-quick@.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Ne 2020-02-23 15:02:28 CET; 7s ago
     Docs: man:wg-quick(8)
           man:wg(8)
           https://www.wireguard.com/
           https://www.wireguard.com/quickstart/
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg-quick.8
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg.8
  Process: 10539 ExecStart=/usr/bin/wg-quick up %i (code=exited, status=5)
 Main PID: 10539 (code=exited, status=5)

úno 23 15:02:28 kachnak wg-quick[10539]: [#] ip -4 address add 10.19.49.3/24 dev wg0
úno 23 15:02:28 kachnak wg-quick[10539]: [#] ip link set mtu 1380 up dev wg0
úno 23 15:02:28 kachnak wg-quick[10539]: [#] resolvconf -a tun.wg0 -m 0 -x
úno 23 15:02:28 kachnak wg-quick[10539]: Failed to try-restart nscd.service: Unit nscd.service not found.
úno 23 15:02:28 kachnak wg-quick[10539]: Failed to try-restart unbound.service: Unit unbound.service not found.
úno 23 15:02:28 kachnak wg-quick[10539]: [#] ip link delete dev wg0
úno 23 15:02:28 kachnak systemd[1]: wg-quick@wg0.service: Main process exited, code=exited, status=5/NOTINSTALLED
úno 23 15:02:28 kachnak systemd[1]: Failed to start WireGuard via wg-quick(8) for wg0.
úno 23 15:02:28 kachnak systemd[1]: wg-quick@wg0.service: Unit entered failed state.
úno 23 15:02:28 kachnak systemd[1]: wg-quick@wg0.service: Failed with result 'exit-code'.
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misacek007 2020-02-23 15:09:54 +01:00 committed by GitHub
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@ -14,7 +14,7 @@ sudo add-apt-repository ppa:wireguard/wireguard
sudo apt update
# Install the tools and kernel module:
sudo apt install wireguard openresolv
sudo apt install wireguard openresolv nscd
```
For installation on other Linux distributions, see the [Installation](https://www.wireguard.com/install/) page on the WireGuard site.