省流：文件或目录权限原因

chmod 600 /home/pi/.ssh/authorized_keys
chmod 700 /home/pi/.ssh
chmod go-w /pi/user

分析

目前需求是电脑使用ssh私钥登录设备而不需要输入密码
在电脑端执行ssh-copy-id pi@192.168.1.11后提示正常

Now try logging into the machine, with:   "ssh 'pi@192.168.1.11'"
and check to make sure that only the key(s) you wanted were added.

但登录依然需要输入密码

$ ssh 'pi@192.168.1.11'
pi@192.168.1.11's password:

在设备端执行service sshd status可以看到错误信息

Authentication refused: bad ownership or modes for file /home/pi/.ssh/authorized_keys

查看网络资料获知，ssh服务不希望组具有对home和.ssh目录写权限，另外authorized_keys应为600

尝试

1. 执行chmod 600 /home/pi/.ssh/authorized_keys后依然登录失败，提示：

   Authentication refused: bad ownership or modes for directory /home/pi/.ssh
   

2. 执行chmod 700 /home/pi/.ssh后依然登录失败，提示：

   Authentication refused: bad ownership or modes for directory /home/pi
   

3. 执行chmod go-w /pi/user后登录成功