Mythtv V31 won't start

[tobiz]

I've installed MythTV V31 from the ubuntu repository ppa.launchpad.net/mythbuntu/31/ubuntu on my ubuntu 18.04 system (on a VirtualBox VM), it installs without error. I can run mythtv-setup without error. If I try to run mythbackend I get:

Code: Select all

mythbackend: symbol lookup error: mythbackend: undefined symbol: _Z15newEpifromDupIn18RecordingDupInType

.
If I run mythfrontend I get:

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 /usr/bin/mythfrontend.real: symbol lookup error: /usr/bin/mythfrontend.real: undefined symbol: _ZN2TV15PlaybackExitingEPS_

.
Any suggestions as to what's wrong?
I previously built MythTV V30 from source and run that successfully on this environment and think(?) I've removed all vestiges of this before installing V31 (apart from the db which mythtv-setup 31 upgraded when first run).
I've used the package manager to remove V31 and re-installed it but get same result.

[blm-ubunet]

Symbol errors are usually lib version/build mismatches.

I would look (& delete) in:
/usr/local/bin/myth*
/usr/local/include/mythtv/
& most importantly..
/usr/local/lib/libmyth*

then run:
sudo ldconfig

[tobiz]

Thanks for this. I tried the suggested actions and reinstalled mythtv V31 from the ubuntu package. The result was even the backend now fails to start. I'm abandoning this approach.

[bill6502]

Agree with blm-ubunet. Try: ldconfig --print-cache|grep myth|grep 31 .
Perhaps v31 was built too and has stale libraries hanging around.

[tobiz]

Thanks for these. I've abandoned building and running in a VM. I suspect mythtv seems to get confused as to what the IP address is for localhost. I've resorted to a clean build of V31 in a 'real' ubuntu 18.04 and everything works.