Magento 2 Component manager won't sync: Continuos "please wait"

[ZeddenIT]

Similar issue. It was working fine and i was even able to install a couple of extensions from the marketplace. Now however stuck at the same "Please wait" and loading page does not move forward. Magento 2.1.5 on Ubuntu Server 16.04 LTS. Any direction with details would be appreciated. Thanks.

[daveyx]

same issue here after migration from 1.9.3.2 to magento 2.1.6 on ubuntu 16.04 LTS with php5.6, increased memory limit to 2GB, chown -R www-data:www-data .

before migration i can access component manager, but after migration:

sync not working, "Please wait..." never disapears

apache starts consuming a lot of CPU

what can we do?

Edit:

just found out with "Network" in chrome debugger:

Request URL:http://localhost/setup/index.php/session/prolong

this ajax call never returns and will be executed again and again

it happens in angular.js:7715

PLEASE HELP !

[daveyx]

this one helped me:

https://github.com/magento/magento2/issues/4756#issuecomment-223439006

don't know why, but i had two repos in my composer.json

removed the second one, only one was left and then the issue disappeared