Just to make tings clear, I know very little about Linux client. I know that windows client needs to be updated manually and in-client update command does not work, maybe Linux does and you are already updated. If so, then the rebuild+download+syncing should do the trick. Check the version, you should be 3.7.0 or 3.7.7, if it is, you are updated.
P.S. No need to up-vote me every time, I like to help, and many other people deserve your up-vote at higher power as well;)
RE: Results of the contest "Tell me what to buy right now! [23] GRIDCOIN (GRC) , BITSHARES (BTS) and EOS (EOS)" by toofasteddie