Tag Archive | boot manager

My September Tumbleweed install

For this month, I decided to install the 20150903 Tumbleweed snapshot.  I planned to install on an external drive, and to install only KDE (i.e. Plasma 5).

This install turned out to be a disaster.  But that’s why I do these monthly installs.  I have reported the problems as bug 944662.

Downloading

The downloading went well.  I used “aria2c” to download “openSUSE-Tumbleweed-DVD-x86_64-Snapshot20150903-Media.iso”.  And I used “wget” to download the checksum file “openSUSE-Tumbleweed-DVD-x86_64-Snapshot20150903-Media.iso.sha256”.  I then used “gpg” to verify the signature on the checksum file.  And I used “sha256sum” to compare the checksum of the downloaded iso with that in the checksum file.  All went well.

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Generic boot code

The expression “generic boot code” simply refers to boot code that is not specific to a particular operating system.

Newer computers are moving toward UEFI booting, but there are still many computers that use BIOS based MBR booting.  And I still have some of those computers.  Booting of such a computer starts with boot code in the MBR (or main boot record).  And typically, that is generic boot code.

MBR booting

First a quick rundown on how MBR booting typically works.

The MBR is the first physical sector on the hard drive.  When you power on the computer, the BIOS loads that sector into memory at a standard location, and then jumps to that memory location (starts running instructions from there).  Normally a properly initialized MBR will have 0xaa55 as the last 16 bits (that’s hexadecimal).  This is a boot flag and indicates that the disk is bootable.  The BIOS usually checks for this flag before it jumps to the boot code that it has loaded from the MBR.

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My install for June

I have been doing monthly installs of Tumbleweed, mainly to test out the installer.  For June, I installed the 20150608 snapshot.  I used the DVD installer (written to a USB), and this was for the 64-bit version.

Short “tl;dr” version — the install went pretty well, with only one minor problem.

Downloading

As usual, I used “aria2c” to download the file “openSUSE-Tumbleweed-DVD-x86_64-Snapshot20150608-Media.iso”.  In addition, I used “wget” to download “openSUSE-Tumbleweed-DVD-x86_64-Snapshot20150602-Media.iso.sha256”.  This is a small file which contains the sha256 checksum for the iso.  I used “gpg –verify” to check the digital signature on that “.sha256” file.  I then compared the listed checksum of the iso with the one that I computed using the “sha256sum” command.  Everything checked as okay.

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Two version of linux — my setup

In this post, I’ll describe what I do when I want two versions of linux.  Typically, one is for normal use and the other is for testing.  I noticed some confusion about how to do this in a recent thread at opensuse forums.  So I thought it might be of interest to describe what I am doing.

This is intended for information only.  Of course there are many different ways of handling this.  I am describing just one of them.

The particular computer is an older one that uses legacy (MBR) booting.  It was my main desktop, until around two years ago.  Now I mainly use it for testing and as a backup in case my main desktop fails.

I currently have both opensuse 13.1 and opensuse 13.2 installed.  I also have another partition for test installs.  Opensuse 13.2 is a 64-bit install, while opensuse 13.1 is a 32-bit install (actually the “linux for education” version. Read More…

Encrypted disk without a separate “/boot”

When support for legacy grub (or grub1) was dropped for opensuse 13.2, one of the reasons was to make it easier to support encryption without a separate unencrypted “/boot” partition.  Recent releases of grub2 have some support for accessing encrypted file systems, so it was mostly a matter of adding support to the installer.

I decided to test how that works.  So I did a test install of opensuse 13.2 into an encrypted LVM, without a separate “/boot”.  The Yast installer was happy with that.  It did not complain that there was no “/boot”.  So I continued through the full install.

There were no install errors reported.  But it didn’t work.  Instead, while booting, I got a grub shell.  And the grub shell did not offer any commands related to crypto.

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Installing Tumbleweed, Jan 2015

I am planning to do a clean install of Tumbleweed every month.  This will usually be a throwaway install.  That is, I won’t be intending to keep the installed system.  Rather, I am trying out the installer and I will report any bugs that I might find.  I’m doing this because Tumbleweed is, in effect, a preview of the next mainline release (opensuse 13.3).

On this occasion, my install was to my laptop.  I actually installed to an external 80G hard drive connected to the laptop.

Quick summary

The quick summary is that install mostly went well.  I went with defaults for many options, so that the install resulted in the KDE desktop.  The main surprise was to notice that the default MTA (mail transfer agent) is now “exim” rather than “postfix”. Read More…

The Windows 8.1 update and linux

The news from the Windows front has been that there is a new update to Windows 8.1, which is supposed to cure all of the failings of Windows 8/Windows 8.1.  From the reports that I have seen, many folk are disappointed.  Apparently, the update doesn’t provide what they had been hoping for.

Apart from the disappointment, it does seem that this is a required update.  Future updates to Windows 8.1 are expected to build on this update.

Initial failure

So I went ahead and installed the update.  Or, at least, I attempted to install the update.  It’s a large update, with something like a 750M download.  There were several other updates in this weeks collection, so I told Windows to install them all.

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Review: The Lenovo ThinkServer TS140

One of my computers was having problems.  I might try replacing the disk drive and see if that helps.  However, it is an older computer, so I decided that I needed a replacement.

I looked at several sites, including Dell and HP.  I also looked at Amazon.  One of the computers that showed up in the Amazon listing of desktops, was the Lenovo ThinkServer TS140.  And it looked interesting, and reasonably priced.  The Amazon reviews were mostly quite good.  After a few days to think about it, I decided to go with the ThinkServer.

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Opensuse 13.1RC2

Release candidate 2 was made available yesterday.  As you might expect, I have already downloaded it and attempted a couple of installs.

Quick summary

This seems to correct most of the problems with earlier pre-release versions.  The installed system is running kernel 3.11.3.  KDE is at version 4.11.2 and Gnome is at version 3.10.1.  The release will have code name “Bottle”, and is expected to be an LTS release.  That is to say, after the normal end of support, it will go to evergreen extended support. Read More…

Mixing UEFI and MBR

As mentioned in an earlier post, I recently took the hard drive from an older MBR based system, and installed in a newer UEFI box.  Opensuse 12.3 was already installed on the older system, set to boot with grub2 and booting from the partition boot record in “/boot”.  I now wanted to use it in the UEFI box without reinstalling.

One way of booting the older disk would be to disable secure boot in the UEFI firmware, and make sure that legacy BIOS support is enabled.  Then, using the BIOS boot menu (hit F12 during boot on this box), I could select to boot the older system.  That works (or worked – perhaps it doesn’t work now).  But I wanted to boot as a UEFI system.

It turns out that there were no huge problems in doing this.  So perhaps this will be a boring post. Read More…