OK, after type this command, it displays:<div><br><div><div><font color="#3366ff">slim@lab:~$ sudo update-grub </font></div><div><font color="#3366ff">[sudo] password for slim: </font></div><div><font color="#3366ff">Searching for GRUB installation directory ... found: /boot/grub</font></div> <div><font color="#3366ff">Searching for default file ... found: /boot/grub/default</font></div><div><font color="#3366ff">Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst</font></div><div><font color="#3366ff">Searching for splash image ... none found, skipping ...</font></div> <div><font color="#3366ff">Found kernel: /boot/vmlinuz-3.2.0-34-generic</font></div><div><font color="#3366ff">Found kernel: /boot/vmlinuz-3.2.0-33-generic</font></div><div><font color="#3366ff">Found kernel: /boot/vmlinuz-3.2.0-31-generic</font></div> <div><font color="#3366ff">Found kernel: /boot/vmlinuz-3.0.0-20-generic</font></div><div><font color="#3366ff">Found kernel: /boot/memtest86+.bin</font></div><div><font color="#3366ff">Updating /boot/grub/menu.lst ... done</font></div> <div><br></div>And I see my <span style="color:rgb(51,102,255)">/boot/grub/menu.lst</span> file content is :</div><div><br></div><div><div><font color="#3366ff">default<span class="Apple-tab-span" style="white-space:pre"> </span>0</font></div> <div><font color="#3366ff"><br></font></div><div><font color="#3366ff">## timeout sec</font></div><div><font color="#3366ff"># Set a timeout, in SEC seconds, before automatically booting the default entry</font></div><div> <font color="#3366ff"># (normally the first entry defined).</font></div><div><font color="#3366ff">timeout<span class="Apple-tab-span" style="white-space:pre"> </span>3</font></div><div><font color="#3366ff"><br></font></div> <div><font color="#3366ff">## hiddenmenu</font></div><div><font color="#3366ff"># Hides the menu by default (press ESC to see the menu)</font></div><div><font color="#3366ff">hiddenmenu</font></div><div><font color="#3366ff"><br> </font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">## ## End Default Options ##</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-34-generic</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-34-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro quiet splash </font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-34-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-34-generic (recovery mode)</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-34-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro single</font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-34-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-33-generic</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-33-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro quiet splash </font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-33-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-33-generic (recovery mode)</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-33-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro single</font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-33-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-31-generic</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-31-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro quiet splash </font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-31-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.2.0-31-generic (recovery mode)</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.2.0-31-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro single</font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.2.0-31-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.0.0-20-generic</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.0.0-20-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro quiet splash </font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.0.0-20-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, kernel 3.0.0-20-generic (recovery mode)</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/vmlinuz-3.0.0-20-generic root=UUID=5c87fc01-787f-4e4a-802f-a11333216f5b ro single</font></div> <div><font color="#3366ff">initrd<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/initrd.img-3.0.0-20-generic</font></div><div><font color="#3366ff"><br></font></div><div><font color="#3366ff">title<span class="Apple-tab-span" style="white-space:pre"> </span>Ubuntu 12.04.1 LTS, memtest86+</font></div> <div><font color="#3366ff">uuid<span class="Apple-tab-span" style="white-space:pre"> </span>5c87fc01-787f-4e4a-802f-a11333216f5b</font></div><div><font color="#3366ff">kernel<span class="Apple-tab-span" style="white-space:pre"> </span>/boot/memtest86+.bin</font></div> <div><font color="#3366ff"><br></font></div><div><font color="#3366ff">### END DEBIAN AUTOMAGIC KERNELS LIST</font></div></div><div> </div><div>The 3.2 kernel titles do show in the menu.lst, but when I restart my computer, I can't see the options. I really don't know why!</div> <div><br></div><div><div class="gmail_quote">2012/11/16 Colin Law <span dir="ltr"><<a href="mailto:clanlaw@googlemail.com" target="_blank">clanlaw@googlemail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div class="HOEnZb"><div class="h5">On 16 November 2012 02:14, Chen Liang <<a href="mailto:slimhigh@gmail.com">slimhigh@gmail.com</a>> wrote:<br> > Hello, Every one.<br> ><br> > I find I can't use the new kernel on my Ubuntu 12.04. The kernels I have<br> > installed :<br> ><br> > slim@lab:~$ dpkg --get-selections | grep linux<br> > libselinux1 install<br> > libselinux1:i386 install<br> > linux-firmware install<br> > linux-generic install<br> > linux-headers-3.2.0-31 install<br> > linux-headers-3.2.0-31-generic install<br> > linux-headers-3.2.0-33 install<br> > linux-headers-3.2.0-33-generic install<br> > linux-headers-generic install<br> > linux-image-3.0.0-12-generic deinstall<br> > linux-image-3.0.0-17-generic deinstall<br> > linux-image-3.0.0-19-generic deinstall<br> > linux-image-3.0.0-20-generic install<br> > linux-image-3.0.0-22-generic deinstall<br> > linux-image-3.0.0-26-generic deinstall<br> > linux-image-3.2.0-31-generic install<br> > linux-image-3.2.0-33-generic install<br> ><br> > My computer is running for several days, and every time the update-manager<br> > updated my computer, I didn't restart my computer. Today, I found that I had<br> > installed the 3.2 kernel, but when I restart the computer, the grub menu<br> > didn't show that I had a 3.2 kernel to select. So I can not use the 3.2<br> > kernel. The uname result is:<br> ><br> > slim@lab:~$ uname -a<br> > Linux lab 3.0.0-20-generic #34-Ubuntu SMP Tue May 1 17:24:39 UTC 2012 x86_64<br> > x86_64 x86_64 GNU/Linux<br> <br> </div></div>Does running, in a terminal<br> sudo update-grub<br> fix it. If not what is the output of that command?<br> <br> Colin<br> <div class="HOEnZb"><div class="h5"><br> ><br> > --<br> > Best Regards!<br> ><br> > Chen Liang<br> > Beijing Institute of Technology<br> ><br> > �� <br> ><br> > ��<br> > ��ѧ<br> ><br> ><br> </div></div><span class="HOEnZb"><font color="#888888">> --<br> > ubuntu-users mailing list<br> > <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a><br> > Modify settings or unsubscribe at:<br> > <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a><br> ><br> <br> --<br> ubuntu-users mailing list<br> <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a><br> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a><br> </font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><div>Best Regards!</div><div><br></div><div>Chen Liang </div><div>Beijing Institute of Technology</div><div><br></div>�� <div><br><div>��</div> <div>��ѧ</div></div><br> </div></div>