Right for Ardour version, but there was a KX studio repository update. A pre-compilation issue? I updated many packages that day, but I can’t say what else would have solved the problem:
Start-Date: 2018-08-20 12:30:09
Commandline: /usr/sbin/synaptic
Upgrade: drumgizmo:amd64 (0.9.14-1kxstudio1, 0.9.16-1kxstudio1), hexter:amd64 (1.0.2-1kxstudio1, 1.1.0-1kxstudio2), carla-bridge-wine64:amd64 (1.9.5+git20160114, 1.9.8+git20180819), distrho-prom:amd64 (20170617, 20180427), lufsmeter-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), obxd-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), distrho-mini-series:amd64 (20170617, 20180427), samplv1-lv2:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), sndfile-programs:amd64 (1.0.27-1kxstudio2, 1.0.28-1kxstudio3), samplv1:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), drumkv1-common:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), distrho-ndc-plugs:amd64 (20170617, 20180427), tal-plugins-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), juced-plugins-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), gxplugins:amd64 (20180213, 20180604.2), drumkv1-lv2:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), dexed-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), flashplugin-installer:amd64 (28.0.0.137ubuntu0.14.04.1, 30.0.0.154ubuntu0.14.04.1), artyfx:amd64 (1.3+git20171104-1kxstudio1, 1.3+git20180320-1kxstudio1), distrho-plugin-ports-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), synthv1:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), synthv1-lv2:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), flac:amd64 (1.3.1-1kxstudio2, 1.3.2-1kxstudio1), guitarix:amd64 (0.36.1+git20180124, 0.37.2+git20180604), ardour:amd64 (5.12.0-1kxstudio1, 5.12.0-1kxstudio2), drowaudio-plugins-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), pitcheddelay-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), klangfalter-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), qmidiarp:amd64 (0.6.4-1kxstudio1, 0.6.6+git20180814), padthv1-lv2:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), easyssp-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), arctican-plugins-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), calf-plugins-git:amd64 (0.90.0+git20180604, 0.90.1+git20180816), sordi:amd64 (0.16.1+git20170321-1kxstudio1, 0.16.1+git20180413), luftikus-lv2:amd64 (20180101-1kxstudio1, 20180404-1kxstudio3), padthv1-common:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), lv2-dev:amd64 (1.15.3+git20170321-1kxstudio2, 1.15.3+git20180413), distrho-plugins-lv2:amd64 (20170617, 20180427), synthv1-common:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), distrho-nekobi:amd64 (20170617, 20180427), samplv1-common:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), x42-plugins:amd64 (20170428-1kxstudio2, 20180320-1kxstudio1), suil-libs:amd64 (0.8.7+git20170321-1kxstudio1, 0.10.0+git20180711), distrho-mverb:amd64 (20170617, 20180427), drumkv1:amd64 (0.8.6-1kxstudio2, 0.9.2-1kxstudio1), mod-sdk-lv2:amd64 (1.1.1~git20170829, 1.1.1~git20180402)
End-Date: 2018-08-20 12:32:31