Hi, Thanks for your hint Peter Palensky to roll back the installation :D With this tip I stripped down that the bug depends on the samba upgrade from 2:4.1.17+dfsg-2+deb8u2 to 2:4.2.10+dfsg-0+deb8u2
With following state everything works as expected: apt list --upgradable Listing... libldb1/stable 2:1.1.20-0+deb8u1 amd64 [upgradable from: 2:1.1.17-2+deb8u1] libsmbclient/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] libwbclient0/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] python-ldb/stable 2:1.1.20-0+deb8u1 amd64 [upgradable from: 2:1.1.17-2+deb8u1] python-samba/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba-common/stable 2:4.2.10+dfsg-0+deb8u2 all [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba-common-bin/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba-dsdb-modules/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba-libs/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] samba-vfs-modules/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] smbclient/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] tdb-tools/stable 1.3.6-0+deb8u1 amd64 [upgradable from: 1.3.1-1] winbind/stable 2:4.2.10+dfsg-0+deb8u2 amd64 [upgradable from: 2:4.1.17+dfsg-2+deb8u2] after performing this upgrade the bug appears. Rolling back to this state everything works ok. Cheers Ulli