I have the same problem (Inkscape 0.92.2, openSUSE Leap 42.3). As a temporary fix, it is possible for me to use the bold version by writing the weight directly into the style field.
** Attachment added: "Choosing the weight by typing it manually" https://bugs.launchpad.net/inkscape/+bug/1470878/+attachment/5052123/+files/ubuntu_bold.png -- You received this bug notification because you are a member of Ubuntu Studio Bugs, which is subscribed to inkscape in Ubuntu. Matching subscriptions: Ubuntu Studio Bugs https://bugs.launchpad.net/bugs/1470878 Title: ubuntu bold font unavailable Status in Inkscape: New Status in inkscape package in Ubuntu: Confirmed Bug description: as can be seen from the attached image the bold weight of the ubuntu is for an unknown reason not available in the style section of the text-and-font tool. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: inkscape 0.91-3ubuntu1 ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8 Uname: Linux 3.19.0-21-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.1 Architecture: amd64 CurrentDesktop: XFCE Date: Thu Jul 2 14:15:31 2015 InstallationDate: Installed on 2014-10-21 (253 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) SourcePackage: inkscape UpgradeStatus: Upgraded to vivid on 2015-05-06 (57 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/inkscape/+bug/1470878/+subscriptions -- Mailing list: https://launchpad.net/~ubuntustudio-bugs Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~ubuntustudio-bugs More help : https://help.launchpad.net/ListHelp