<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Read on about Lubuntu 12.10 after this intro: I have been troubleshooting a behavior in which many LTSP clients on my Lubuntu 12.10 LTSP server fail to boot. They stall after the Lubuntu splash screen at a blank, black screen. But one of the PC's that fails to boot as an LTSP client also * has enough resources to boot the Lubuntu 12.10 Live CD *, so I tried that, and I found that it fails to boot with the same stalled blank, black screen after the Lubuntu splash screen. I left it like that for ~ 15 minutes to check for an 8-minute stall (which another user reported elsewhere), and it didn't budge. Since Valerio P is troubleshooting (below) what seems like the same behavior with LTSP clients on Edu/Ubuntu 12.04 servers, and since I show the same behavior also on a Lubuntu 12.10 Live CD, I now wonder if this is a *buntu 12.04/12.10 problem related to certain chipsets or video chips. Complicating that observation somewhat, I note this machine I just ran the Live CD on had run both Lubuntu and Ubuntu 12.04 without such a behavior. On 12/4/2012 4:16 PM, John Hupp wrote: > Valerio Pachera on the Edubuntu list has been troubleshooting what seems like the very same problem. His thread came apart somehow but you can see all the posts here: <a href="https://lists.ubuntu.com/archives/edubuntu-users/2012-December/thread.html">https://lists.ubuntu.com/archives/edubuntu-users/2012-December/thread.html</a> > > He got his clients working *most* of the time by disabling NBD compression. (Undoubtedly performance has taken a hit.) He refers to documentation of a previous problem with NBD compression on fat clients which presumably was solved, but now gives the appearance of having returned. See <a href="https://help.ubuntu.com/community/UbuntuLTSP/FatClients#Reenabling_NBD_compression">https://help.ubuntu.com/community/UbuntuLTSP/FatClients#Reenabling_NBD_compression</a>. However, one LTSP guru replied that it was likely that NBD compression was not the cause of the problem, but was merely allow the real cause to manifest this behavior. > > I checked out the NBD compression issue nonetheless. On my server, there was no /etc/ltsp/ltsp-update-image.conf file, but I created one, added the NO_COMP line, and updated the image. This did not solve the problem with any clients I tested. Though our respective setups are different on a number of points, detailed pretty well here: <a href="https://lists.ubuntu.com/archives/edubuntu-users/2012-December/007206.html">https://lists.ubuntu.com/archives/edubuntu-users/2012-December/007206.html</a> </body> </html>