I found some more solution form net and this will definitely work in your case. so all you need is to modify the permissions along with the attributes of your system sleep files which will assist you for doing this suspend or else hibernate task on your ubuntu system. And perform this process you require to run below mentioned code on your terminal windows of the ubuntu method. It assists you to set the attributes along with permissions to its desired way. And in addition, with this code, you are able to carry out usual hibernate or else suspend task on this Ubuntu without any further problems .
Code:
sudo chmod 755 /etc/pm/sleep.d/20_custom-ehci_hcd
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