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https://khws4v1.myhome.cx/article/2017/08/owncloud-8-1%e3%81%8b%e3%82%89owncloud-10-0%e3%81%ab%e3%82%a2%e3%83%83%e3%83%97%e3%82%b0%e3%83%ac%e3%83%bc%e3%83%89/
ownCloud 8.1からownCloud 10.0にアップグレード