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[linkku <1615197@xxxxxxxxxxxxxxxxxx>]

An easy workaround was to add "ExecStartPre=/bin/sleep 15" line into my
/lib/systemd/system/mythtv-backend.service file:

[Service]
User=mythtv
EnvironmentFile=-/etc/mythtv/additional.args
ExecStartPre=/bin/sleep 15
ExecStart=/usr/bin/mythbackend --quiet --syslog local7 $ADDITIONAL_ARGS
StartLimitBurst=10
StartLimitInterval=10m
Restart=on-failure
RestartSec=1

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https://bugs.launchpad.net/bugs/1615197

Title:
  "all tuners are currently busy" and mythweb not working properly

Status in Mythbuntu:
  New

Bug description:
  I did a fresh install of Mythbuntu 16.04. I have 3 identical Hauppauge
  Nova TD dual USB DVB-T tuners that use the DiBcom 7000PC driver. After
  a reboot if I try to watch live TV I get a message "All tuners are
  currently busy".

  In addition to "all tuners are currently busy" my mythweb has all the
  headers in place but the Listings page has no content and says:
  "Warning at
  /usr/share/mythtv/mythweb/modules/_shared/tmpl/default/header.php,
  line 12: !!NoTrans: Cannot modify header information - headers already
  sent by (output started at
  /usr/share/mythtv/mythweb/modules/_shared/tmpl/default/header.php:152)!!"

  After a backend restart 'sudo /etc/init.d/mythtv-backend restart'
  everything works.

  This is possibly related to tuners not being ready before mythbackend
  starts up. There are a few possible workarounds, but I haven't picked
  one simple enough yet.

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