开发板使⽤tftp服务传输⽂件（安装失败与解决）
服务端：ubuntu  客户端：ARM开发板
安装失败过程：
先是参考了先后安装了xinetd tftp tftpd ，也新建了/etc/xinetd.d/tftp
重启服务后，在本机使⽤tffp测试传输⽂件，⼀直显⽰超时，关闭防⽕墙等措施也没⽤。
尝试卸载 sudo apt-get remove xinetd tftp tftpd , 再重新安装时报错：
...
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up tftpd-hpa (5.2+20150808-1ubuntu4) ...
tftpd user (tftp) already exists, doing nothing.
tftpd-hpa directory (/srv/tftp) already exists, doing nothing.
Job for tftpd-hpa.service failed because the control process exited with error code.
See "systemctl status tftpd-hpa.service" and "journalctl -xe"for details.
invoke-rc.d: initscript tftpd-hpa, action "start" failed.
* tftpd-hpa.service - LSB: HPA's tftp server
Loaded: loaded (/etc/init.d/tftpd-hpa; generated)
Active: failed (Result: exit-code) since Tue 2021-11-2318:08:20 CST; 3ms ago
Docs: man:systemd-sysv-generator(8)
Process: 28678 ExecStart=/etc/init.d/tftpd-hpa start (code=exited, status=71)
Nov 2318:08:20 tianyu systemd[1]: Starting LSB: HPA's
Nov 2318:08:20 tianyu tftpd-hpa[28678]:  * Starting HPA's tftpd in.tftpd
Nov 2318:08:20 tianyu systemd[1]: tftpd-hpa.service: Control process exited, code=exited, status=71/OSERR
Nov 2318:08:20 tianyu systemd[1]: tftpd-hpa.service: Failed with result 'exit-code'.
Nov 2318:08:20 tianyu systemd[1]: Failed to start LSB: HPA's tftp server.
dpkg: error processing package tftpd-hpa (--configure):
installed tftpd-hpa package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
tftpd-hpa
E: Sub-process /usr/bin/dpkg returned an error code (1)
参考该博客：解决问题
参考：
exited可知，要么安装tftp-hpa 和tftpd-hpa（tftp的增强版）, 或者安装xinetd , tftp ,tftpd
如果同时安装了并启动了tftp-hpa 和xinetd，会导致tftp-hpa的端⼝被占⽤，导致超时。如何解决：修改xinetd的配置⽂件，关闭服务。

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