openmediavault

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What do you mean? The known_hosts file used by ssh? Or something else? Does wget https://www.github.com work?

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Use omv-upgrade instead.

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According to this:
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Something, somewhere is still looking for it.

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I saw this on my dev system but figured it was just something I caused. You will have to remove the large empty space in the services -> rsync section of the database. make a backup copy of /etc/openmediavault/config.xml and then remove the space.

Yes. I can.
(Quelltext, 12 Zeilen)

Maybe is something related with known_hosts?

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I still see it hitting backports though. What is the output of: grep -ri backport /etc/apt/*

Soma, within etc/apt/sources.list and etc/apt/sources.list.d there are now no backport mentions.

Server was then rebooted.

sudo omv-update was then entered.
(Quelltext, 46 Zeilen)

Server is still on 5.6.26-1 (Usul).

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You can use anything larger. It just won't use the extra space. No need to upgrade all drives just because one drive is bigger.

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Nope. Only the kernel and compose plugins actually depend on the omv-extras plugin being installed.

I don't see anything that points to the VM's network causing the problem. Can you wget from other site?

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Nope. Only the kernel and compose plugins actually depend on the omv-extras plugin being installed.