I was using DrRacket for a class using PLAI on Ubuntu 11.10 with some issues before the complete failure in 12.04 Beta 2. It was very slow when it came to scrolling with my trackpoint, but moving aroung with the keyboard only or with an external mouse with a wheel moved slowly, but didn't freeze DrRacket for many seconds and then move a whole lot like it did with the trackpoint. I'm not sure if that was some kind a precursor to the trouble I am having now. I believe some of that problem came about because of Ubuntu's new Unity interface.
When I installed changed to the 12.04 Beta 2 of Ubuntu, I tried to install the DrRacket version available in the Ubuntu Software Center that was working on 11.10. It installed, but then would not run. I then tried toi install the follwing versions from the website: debian_squeeze x86_64, fedora 14 x86_64, ubuntu karmic i386. Those did not work either. Finally, I resorted to compiling the Unix source myself, which also failed. I don't know if you all can help me with this or if this is something I need to contact Canonical about, but any suggestions are very welcome. I know this might be because I am using a Beta version, but since the full version comes out in 18 days I had hoped that it would still be fairly stable. For the most part, it is quite stable. I would have waited until the final release came out before emailing you all about this, but since I need it for class, I decided to send this now. The error would occur whenever I tried to run drracket in the terminal. After every installation (I did uninstall the each previous attempt before trying again with a different version) I would do this: jack@jack-ThinkPad-W520:~$ drracket The result was always: ffi-lib: couldn't open "libjpeg.so.62" (libjpeg.so.62: cannot open shared object file: No such file or directory) === context === /usr/lib/racket/collects/racket/draw/unsafe/jpeg.rkt: [running body] /usr/lib/racket/collects/racket/draw/private/bitmap.rkt: [traversing imports] /usr/lib/racket/collects/racket/draw/private/dc.rkt: [traversing imports] /usr/lib/racket/collects/racket/draw/private/svg-dc.rkt: [traversing imports] /usr/lib/racket/collects/racket/draw.rkt: [traversing imports] /usr/lib/racket/collects/mred/private/kernel.rkt: [traversing imports] /usr/lib/racket/collects/mred/private/const.rkt: [traversing imports] /usr/lib/racket/collects/mred/private/check.rkt: [traversing imports] /usr/lib/racket/collects/mred/private/mred.rkt: [traversing imports] /usr/lib/racket/collects/mred/mred.rkt: [traversing imports] /usr/lib/racket/collects/mred/main.rkt: [traversing imports] /usr/lib/racket/collects/racket/gui/base.rkt: [traversing imports] /usr/lib/racket/collects/drracket/drracket.rkt: [traversing imports] How can I fix this? Running 'racket" from the terminal works just fine, so I know the installation was at least partially successful. I can use another editor (GVim, nano, Vi, Emacs) or the like, but right now, I really don't want to learn a new editor in the midst of a class. I do not, in any manner, intend to accuse anyone of anything in this e-mail; I just need help. Any and all help, again, would be greatly appreciated.
____________________ Racket Users list: http://lists.racket-lang.org/users
