It's because RefuseManualStart=yes is in graphical-session-pre.target. The run-* scripts start graphical-session-pre.target explicitly, because https://github.com/systemd/systemd/issues/3750 means that it doesn't work properly wrt. ordering if you just start the end .target.
I'm guessing this should be =no until that bug is fixed. ** Bug watch added: github.com/systemd/systemd/issues #3750 https://github.com/systemd/systemd/issues/3750 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1615341 Title: Yakkety desktop fails to start Status in systemd package in Ubuntu: New Bug description: Following a set of updates (attached) Saturday 20th I lost a working desktop. Further to that dailies for Xubuntu and Mate both fail to start a working desktop either by: 1 - booting Try option from the first menu 2 - booting Try option from the Try/Install dialogue 3 - logging into installed system For Xubuntu (both locally and in installed daily) Changing the Exec line in /usr/share/xsessions/xubuntu.desktop from Exec=/usr/share/xfce4/scripts/run-systemd-session xubuntu- session.target to Exec=startxfce4 and my normal desktop runs again. (Found all this out after I reported bug 1615338, which I've now marked invalid) ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: systemd 231-4 ProcVersionSignature: Ubuntu 4.6.0-10.12-generic 4.6.5 Uname: Linux 4.6.0-10-generic x86_64 ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 CurrentDesktop: XFCE Date: Sun Aug 21 08:59:13 2016 InstallationDate: Installed on 2016-06-11 (70 days ago) InstallationMedia: Xubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160611) MachineType: NOVATECH LTD MBB-44608 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.6.0-10-generic root=UUID=246fbeaf-5feb-4078-9c56-10a03b4fafa1 ro quiet splash SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/19/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F5 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H81M-DS2V dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: 7383241-001 dmi.chassis.type: 3 dmi.chassis.vendor: NOVATECH LTD dmi.chassis.version: V1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5:bd06/19/2014:svnNOVATECHLTD:pnMBB-44608:pvrV1.0:rvnGigabyteTechnologyCo.,Ltd.:rnH81M-DS2V:rvrTobefilledbyO.E.M.:cvnNOVATECHLTD:ct3:cvrV1.0: dmi.product.name: MBB-44608 dmi.product.version: V1.0 dmi.sys.vendor: NOVATECH LTD modified.conffile..etc.systemd.journald.conf: [modified] mtime.conffile..etc.systemd.journald.conf: 2016-07-21T07:46:55.198735 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1615341/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
