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https://github.com/steemit/steem/releases/tag/v0.12.2

"This is a soft-fork and an update to Hard Fork 12 to address oversized blocks and transactions. All witnesses should update as soon as possible."

That should do it.

Could you please explain what should I do, just change the file steemd ? How can I make it on Ubuntu server using commands, I have installed the miner using manual and dont know how to replace a file :)