Another fresh issue, pretty straight forward but if you are facing this issue with the error in apache saying
libgomp: Thread creation failed: Resource temporarily unavailable, referer: https://xxxxx.org/wp-admin/media-new.php
this is most likely due to your server limit has been reached either by user level or root level. The quickest way to resolve this temporary is to increase your soft limit as shown below,
ulimit -s 999999
once you've done that. you should try upload file in WordPress and you shouldn't see the HTTP Error message. but to make this permanent after you've reboot.
Open the file located at vi /etc/security/limits.d/90-nproc.conf
* soft nproc 999999 root soft nproc unlimited
update and change the value u see above and it should do the trick. If this doesn't do the trick, you might want to try adding the following to your .htaccess
SetEnv MAGICK_THREAD_LIMIT 1
This happens when the full installation of ImageMagick cannot be done which causes the HTTP Error to show.