nanoPC-T4 在???# sudo apt update 和 sudo apt upgrade??升級或安裝軟件???sudo apt install xxx??時遇到以下問題：??Failed to set up interface with /etc/hostapd/?

Setting up hostapd (2:2.6-15ubuntu2.8) ...
Job for hostapd.service failed because the control process exited with error code.
See "systemctl status hostapd.service" and "journalctl -xe" for details.
invoke-rc.d: initscript hostapd, action "restart" failed.
● hostapd.service - Advanced IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP AuthenticatorLoaded: loaded (/lib/systemd/system/hostapd.service; disabled; vendor preset: enabled)Active: failed (Result: exit-code) since Fri 2022-11-11 07:23:16 UTC; 22ms agoProcess: 12218 ExecStart=/usr/sbin/hostapd -P /run/hostapd.pid -B $DAEMON_OPTS ${DAEMON_CONF} (code=exited, status=1/FAILURE)Nov 11 07:23:16 NanoPC-T4 systemd[1]: Starting Advanced IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP Authenticator...
Nov 11 07:23:16 NanoPC-T4 hostapd[12218]: Configuration file: /etc/hostapd/hostapd.conf
Nov 11 07:23:16 NanoPC-T4 hostapd[12218]: Could not open configuration file '/etc/hostapd/hostapd.conf' for reading.
Nov 11 07:23:16 NanoPC-T4 hostapd[12218]: Failed to set up interface with /etc/hostapd/hostapd.conf
Nov 11 07:23:16 NanoPC-T4 hostapd[12218]: Failed to initialize interface
Nov 11 07:23:16 NanoPC-T4 systemd[1]: hostapd.service: Control process exited, code=exited status=1
Nov 11 07:23:16 NanoPC-T4 systemd[1]: hostapd.service: Failed with result 'exit-code'.
Nov 11 07:23:16 NanoPC-T4 systemd[1]: Failed to start Advanced IEEE 802.11 AP and IEEE 802.1X/WPA/WPA2/EAP Authenticator.
dpkg: error processing package hostapd (--configure):installed hostapd package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:hostapd
E: Sub-process /usr/bin/dpkg returned an error code (1)

【解決】
發現問題
Could not open configuration file '/etc/hostapd/hostapd.conf' for reading.

在目錄下查看 hostapd.conf， 發現沒有該文件，當然無法打開配置文件了。

如何重新找到該文件
在目錄 /usr/share/doc/hostapd 下可以看到有一個 README.Debian 文件, 文件內容如下：

hostapd for Debian
------------------This package provides two methods for managing hostapd process(es); an
initscript and an ifupdown hook. Both methods require creation of a
hostapd daemon configuration file (eg. /etc/hostapd/hostapd.conf) to
function correctly.An example hostapd.conf may be used as a template but _must_ be edited
to suit your local configuration. An example is located at:/usr/share/doc/hostapd/examples/hostapd.conf.gzTo use the example as a template:# zcat /usr/share/doc/hostapd/examples/hostapd.conf.gz > \/etc/hostapd/hostapd.conf# $EDITOR /etc/hostapd/hostapd.confTo use the initscript method of starting a hostapd daemon see
/etc/default/hostapd.To use the ifupdown method, the path to hostapd configuration file can
be specified in a network interfaces configuration stanza in
/etc/network/interfaces like so:iface eth1 inet statichostapd /etc/hostapd/hostapd.conf...The hostapd process will be started in the pre-up phase of ifup, and be
terminated in the post-down phase of ifdown.-- Kel Modderman <kel@otaku42.de>  Tue, 27 Oct 2009 12:03:01 +1000Please note:
* If you want to use hostapd with a Prism2/2.5/3 card in WPA mode, you'll needSTA firmware version >= 1.7.0.-- Faidon Liambotis <faidon@cube.gr>, Mon, 10 Oct 2005 14:57:11 +0300

done

zcat /usr/share/doc/hostapd/examples/hostapd.conf.gz > /etc/hostapd/hostapd.conf

或者下載?地址

pi@NanoPC-T4:~$ sudo apt update
Hit:1 http://ports.ubuntu.com bionic InRelease
Hit:2 http://ports.ubuntu.com bionic-backports InRelease
Hit:3 http://ports.ubuntu.com bionic-proposed InRelease
Hit:4 http://ports.ubuntu.com bionic-security InRelease
Hit:5 http://ports.ubuntu.com bionic-updates InRelease
Reading package lists... Done                      
Building dependency tree       
Reading state information... Done
4 packages can be upgraded. Run 'apt list --upgradable' to see them.
pi@NanoPC-T4:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:u-boot-tools xserver-common xserver-xorg-core xserver-xorg-legacy
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

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