Another option is to remove the generic kernel completely (if you can do all tasks with the rtai kernel). If you started by installing with the LiveCD, then you won't have it on your system. The case Ray described only applies for people who started with a stock 8.04 Ubuntu, and then installed emc2.
sudo apt-get remove linux-image-generic (I think that's the meta package which depends on the latest kernel). Regards, Alex ----- Original Message ----- From: "Ray Henry" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Wednesday, May 28, 2008 03:04 Subject: [Emc-users] Newly updated Ubuntu 8.04 kernel. > > If you are running 8.04, Hardy Heron you need to be aware that Ubuntu > has released a new kernel. When/if you update to this kernel you will > be advised to reboot. It's the little pair of blue arrows up near the > stuff in the top right corner of the Gnome window. When you update, it > will modify the GRUB bootloader's configuration so that when you reboot, > this new kernel will be the default and you will not be able to run EMC2 > unless you change things just a bit. > > This note is from Jeff. > <jepler> now that the -17 kernel is out from ubuntu, I think a lot of > people are going to run into problems at their next reboot (the new > ubuntu kernel will be chosen over the rtai kernel). I don't have time > right now, but can someone write a message to the users list explaining > how to select the right kernel at boot time so that emc can be run? > > You can probably catch the GRUB menu if you're awake when the reboot > starts. Simply press the <esc> key quite a few times while it reboots. > And tab down when the menu shows. You need to run the kernel named > > Linux version 2.6.24-16-rtai > > rather than the new 2.6.24.17 > > so that EMC2 will have access to the proper modules and such. But that > is a nuisance so Jeff's next suggestion is probably the correct way to > fix this for now. > > <jepler> unfortunately without editing grub's menu manually I'm not sure > how to change the default to be the rtai kernel.. > > First let's make a backup of the proper configuration file. Do this by > issuing the following command in a terminal > > sudo cp /boot/grub/menu.lst /boot/grub/menu.lst.backup > > When you press enter, you'll be asked for your user password. Once you > enter that it should make the backup for you. > > Now we need to find your favorite editor. If you'd rather not use > Gedit, ignore the startup stuff here. Open a terminal and enter this > command. > > sudo Gedit /boot/grub/menu.lst > > You'll be asked for your password if this is not the same terminal you > used to make the backup or if the password has timed out. Enter it and > the gedit widget will fill up with a bunch of stuff. Most of it you can > ignore but down near the bottom of that file you will see several blocks > of stuff that looks a bit like this. > > title Ubuntu 8.04, kernel 2.6.24-17-generic > root (hd0,0) > kernel /boot/vmlinuz-2.6.24-17-generic > root=UUID=55655b37-adf7-4806-928a-cdbe2b889492 ro quiet splash > initrd /boot/initrd.img-2.6.24-17-generic > quiet > > and down a way you should find. > > title Ubuntu 8.04, kernel 2.6.24-16-rtai > root (hd0,0) > kernel /boot/vmlinuz-2.6.24-16-rtai > root=UUID=55655b37-adf7-4806-928a-cdbe2b889492 ro quiet splash > initrd /boot/initrd.img-2.6.24-16-rtai > quiet > > This kernel is the one you want to use to run the EMC2 software so we > need to point GRUB to it. To do that, count each block, look for the > word "title" at the start of a line. Count starting with zero until you > get to the title line that shows the -rtai. On mine that is 2. (the > third block) Your setup may well be different because you might have > dual, tripple, or more boot or some such. > > Now you need to move up near the top of the file to a line that reads > something like this. > > default 0 > > and change that line to read like this. > > default (insert the numerical value you counted to here) > > On my box that line reads like this. > > default 2 > > Now immediately below that are a couple of handy things you might want > to also thing about changing. The first is the timeout for the menu. > > timeout 5 > > Put the time you need to come awake in there if you are dual booting. > > This one pretty much explains itself. Just put a (#) in front of the > hiddenmenu line and it will always give you the menu for the time you > set above. > > ## hiddenmenu > # Hides the menu by default (press ESC to see the menu) > hiddenmenu > > For right now, DON"T SCREW with the rest of the file. You can do that > later when you feel adventurous. > > Hope this helps folks around the problem I had not long ago. > > > > Rayh > > > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
