UMs/KnownIssues/UML
From Userful Support
Userful MultiSeat Linux™: Known Issues
Copyright © 2010 - 2012 Userful Corporation. All rights reserved.
(Updated 2012.5.09)
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Introduction
Userful MultiSeat™ is software that extends Linux to support several fully independent and concurrent workstations using a single computer box. This is accomplished by adding video devices (either video cards, USB multiseat devices or USB-over-LAN multiseat devices), keyboards and mice to a single PC system and installing Userful's software.
This software is available as:
- Userful MultiSeat: A stand-alone software package compatible with Ubuntu/Edubuntu.
- Userful MultiSeat Linux : Bundled with Edubuntu and other open-source software, with a focus on software for the educational sector.
| These known issues are for Userful MultiSeat Linux (bundled with Ubuntu/Edubuntu, iTALC and other software). Please also see the known issues for the stand-alone Userful MultiSeat software. |
Known Issues for Userful MultiSeat Linux
Spurious Error Message Appears About Install/Upgrade of "nhci-dkms" Package"
| Applies to: | v.5.0 |
During installation of certain packages (including nhci-dkms) essential for the function of USB-over-LAN stations, the system attempts to compile those packages for all available versions of the Ubuntu kernel. Due to incompatibility issues, this process fails for some older Ubuntu kernels. However, the packages do compile correctly for more recent kernel versions, including the default kernel for Userful MultiSeat Linux 5.0 (3.0.0-16). Functionality is not affected. If this error message appears, click "Close" on the dialogue box and ignore the message.
Hotplugging Too Soon After Initial User Log-in Can Prevent Subsequent Logins (For Users Created During Userful MultiSeat Linux Install)
| Applies to: | 2011 v.4.1 | v.5.0 |
During the installation of Userful MultiSeat Linux, several users accounts are created. The first time one of these accounts is used to log into a session, the user is prompted to enter a new password, and the process of setting up the users home directory is completed. Hotplugging (unplugging and replugging) a station before user home directory is completed can result in a corrupted session and home directory, so that once the user logs out, that username will not be able to log into a session again.
To avoid this situation, be sure to log in and then log out each user account created during installation before hotplugging a session using those accounts.
If a user account gets corrupted in this way, it can easily be fixed by removing the /home/(username)/.userful/station folder. From either the teacher01 or the administrative account, enter the following in a terminal:
sudo rm /home/student01/.userful/station/ -rf
This fix will also remove audio configuration files, so the affected user may need to reset volume levels (once, then audio levels will persist for subsequent sessions).
Disabling or Uninstalling Userful MultiSeat (from Userful MultiSeat Linux) from the Control Center May Require an Additional System Reboot
| Applies to: | 2011 v.4.1 | v.5.0 |
When the Userful MultiSeat component of Userful MultiSeat Linux is disabled or uninstalled, the intended behavior is to return the system to single-user mode after a single reboot. Occasionally, disabling or uninstalling Userful MultiSeat from Userful MultiSeat Linux, from the Control Center will result in either:
- a return to single seat mode with corrupted graphics, or
- a failure to return to single seat mode (indicated by a black screen on the onboard station).
Should either problem occur, a manual reboot (using the power on/off or restart buttons on the host system) is required to return normal function. It may be necessary to disconnect all USB-connected stations to successfully return to single-seat mode.
X Crashes and Restarts on MCT-device Connected Stations When Streaming DVD with "watch-dvd"
| Applies to: | 2011 v.4.1 | v.5.0 |
Driver segmentation faults seem to be causing X to die on stations when viewing streaming DVD on MCT devices using the Userful MultiSeat Linux "watch-dvd" function. There is no workaround at this time.
User Cannot Fully Change Session Language From Log-in When Userful MultiSeat Linux is Installed in a Language Other Than English
| Applies to: | 2011 v.4.0 |
From the Ubuntu/Edubuntu login screen, users are supposed to be able to choose a session language; however when Userful MultiSeat Linux is installed in a language other than English, and a user chooses a session language other than the system language, user interface translations are not working. Only the date will appear in the user's chosen session language. All else will be in the system language.
This bug is related to a bug in Ubuntu; see Ubuntu's bug tracking system for more details.
The workaround is for an administrator to change the system language using the Language Selector, accessed through Administration > Language Support. Please see How to Change System Language for more information.
For more information, view the complete documentation available for Userful MultiSeat Linux 2011.
