Any plugin installation failed - could not copy file error

Question

everytime I install a new plugin for wordpress it says Could not copy file and the files address. Does anybody know why this is the case.

Answer 1

I was facing the same issue but in my case I was updating using FTP.

I fixed it by setting the hostname to "localhost" instead of using the IP.

This is because there was a loop happening and making the file upload fail and that's logged in the /var/log/vsftpd.log

Answer 2

Check file premissions and (important!) file owner or group. If you use apache server group must be www-data (default). This can be a solution