After installing or updating Ubuntu, I am having problems using GRUB to boot my computer. How do I collect information to determine what is wrong so that I can fix it?
When I boot the Ubuntu 12.04 desktop Live CD and run the command sudo apt-get update, the final messages are the warning messages below.
Reading package lists... Done
W: Duplicate sources.list entry cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/ precise/main i386 Packages (/var/lib/apt/lists/Ubuntu%2012.04%20LTS%20%5fPrecise%20Pangolin%5f%20-%20Release%20amd64%20(20120425)_dists_precise_main_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)/ precise/restricted i386 Packages (/var/lib/apt/lists/Ubuntu%2012.04%20LTS%20%5fPrecise%20Pangolin%5f%20-%20Release%20amd64%20(20120425)_dists_precise_restricted_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
However, there do not appear to be any duplicate sources in /etc/apt/sources.list
# /etc/apt/sources.list
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/main/binary-i386/
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/restricted/binary-i386/
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ precise main restricted
deb http://archive.ubuntu.com/ubuntu/ precise main restricted
deb http://security.ubuntu.com/ubuntu/ precise-security main restricted
deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted
I also ran the command gksudo software-properties-gtk and noticed that there are two entries under the Other Software tab for Cdrom with Ubuntu 12.04 'Precise Pangolin'
Removing these two entries in Other Software also eliminates the Duplicate sources.list entry warning messages from apt-get update (as well as other apt-get functions).
I do not understand why those two entries for Cdrom with Ubuntu are present in the Other Software tab. The CD is also already selected as a possible install source under the Ubuntu Software tab. That should be enough, shouldn't it?
Is there an error in the Ubuntu 12.04 Live environment's default configuration of Software Sounces? Or am I doing something (else) wrong?
Is it OK to remove the Cdrom entries under Other Software to eliminate the W: Duplicate sources.list entry cdrom: message?
Update:
I forgot to look at /etc/apt/sources.list after removing the entries from the Other Software tab. After doing that its contents becomes:
# /etc/apt/sources.list
deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ precise main restricted
deb http://archive.ubuntu.com/ubuntu/ precise main restricted
deb http://security.ubuntu.com/ubuntu/ precise-security main restricted
deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted
I'm still confused as to what is going on here. Is
dists/precise/main/binary-i386/ and
dists/precise/restricted/binary-i386/ the same thing as
precise main restricted??
I didn't think so when I first looked at it, but then again removing those entries eliminates the Duplicate sources.list warning messages.
I was not able to determine by searching whether this question has already been asked and answered. My search always turned up some other 32 versus 64 bit question.
I want to know if it is possible to determine whether an inactive Ubuntu install, that is, on a drive you did not boot from, is the 32-bit or 64-bit version. I cannot use uname -m because the Ubuntu I want to know about is not the Ubuntu which is running.
For example, if Ubuntu is installed on the hard drive of a desktop PC and the PC is booted from a Live CD/USB version of Ubuntu is it possible to tell what is installed on the hard drive just by looking at the file system of the Ubuntu on the hard drive?
I have installed Ubuntu 12.04 (Precise Pangolin). If I open System Settings >> Displays there is a new (?) on/off button for a setting named Sticky edges.
Can someone tell me what this setting is supposed to control?
I am new and do not, of course, know a lot about installing and maintaining an Ubuntu release.
One of the "tricks" I have learned to use is sudo apt-get update followed by sudo apt-get upgrade to download and install updates for the installed software.
I recently installed beta 2 of Ubuntu 12.04 (precise pangolin ?) to a test disk/partition just to see what it was like. After the install I updated the software using the commands I listed above because, well, that is what I always do.
Was this a mistake? Are the alpha & beta releases of Ubuntu updated in a different way?
I recently saw reference to the dist-upgrade command for apt-get and decided I would try using that to update 12.04. A lot of programs were upgraded, including the kernel so I'm wondering if using just sudo apt-get upgrade was the wrong way to go for a release which is still under development.