Owncloud 8.2 upgrade 9.0.11 ubuntu 14.5 lts

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Can someone give me advice please.?
I want to upgrade my Owncloud 8.2 upgrade 9.0.11 under ubuntu 14.5 lts Linux

How can i di it?
thanks in advence

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this could be helpful:

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Hi Dimitry
Thank you so much for your help