Tuesday, September 4, 2012

Tech Review Linux: Saturday, September 1, 2012


Error:  apt-get update

W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EA8F35793D8809A

  • the apt-get management tool guarantees the authenticity of the server before updating the Debian OS.
  • used to following command to resolve:
    • gpg --keyserver pgpkeys.mit.edu --recv-key 2EA8F35793D8809A
    • gpg -a --export 2EA8F35793D8809A | sudo apt-key add -
Problems I had:
  • Spelled the name of the key server wrong.
    • MSG
  • Forgot the run the second command.
    • Get the original error message again
PGP: Public Key Servers
  • The MIT server I used is not in the list of recommended servers
    • uses older SKS key server with bug that impairs synchronization from other, non-SKS servers.
  • There is a long list of dead key servers.
  • WARNING:  Just because one obtains a public key from a server does not mean that the key is authentic.
    • Must verify the authenticity of the key and its owner.
How Do I Determine My Linux Kernel Version?
  • uname -r
    • 3.2.0-23-generic

Ubuntu 12.04 LTS 64 bit Wubi Keeps Locking Up

This has been going on for a while.  System often becomes slow and sluggish.  Even trying to bring up a terminal or going to a command prompt will take for ever or not work.  I have noticed that the mount.ntfs process is taking 99% of the processor time.   Have read some where (Sorry, lost the link.) that the NTFS partition might be corrupted.  Also read that updating the kernel might fix the problem.  Also might be a problem with the size of the partition. 


Going to try to see if a dirty or corrupted NFS could be the problem.  This seems like a good possibility to me because with Wubi, the Linux partition is running from NTFS.

  • List partitions in the system
    • sudo fdisk -l
      • I need to look at /dev/sda2
  • Install tools for workingwith NTFS partitions
    • sudo apt-get install ntfsprogs
  • Repair the disk
    • sudo ntfsfix /dev/sda2
I am a little concerned about running the ntfsfix command. 
Which version of ntfsprogs am I using?  

Is the mount.ntfs the NTFS-3G driver?

Is the mount.ntfs using FUSE?

How risky is running this command?
  • What if it destroys my Ubuntu partition?
    • Mount the windows partition to examine it.
      • sudo mount -t ntfs /dev/sda2 /mnt
    • Mount the Wubi drive
      • sudo mkdir /mnt2
      • sudo chmod 777 /mnt2
      • sudo mount -t ext4 /mnt/ubuntu/disks/root.disk /mnt2
        • I was so amazed when this worked!!
    • What would I loose on this drive?
      • BMCS_src
      • Downloads\Rover
      • Downloads\FV_Opensource
    • What would I loose on the windows drive?
      • ubuntu/disks/root.disk
        • the critical files are listed above
      • Backup of Passport/DVDs
      • Backup of Passport/home
      • data/BMCSS_2010_05_03.zip
      • FalconView Class
      • source/Learning FV (* This is important not to lose *)
What does WUBI Stand for?
  • Wubi (Windows-based UBuntu Installer)
OK, time to backup critical files.
  • done
Ready to try fix
  • Unmount the two drives doing the internal Wubi partition first
    • sudo umount /mnt2
    • sudo umount /mnt
  • Try to fix
    • sudo ntfsfix /dev/sda2
mint@mint ~ $ sudo ntfsfix /dev/sda2
Mounting volume... OK
Processing of $MFT and $MFTMirr completed successfully.
NTFS volume version is 3.1.
NTFS partition /dev/sda2 was processed successfully.

Doesn't seem to have done anything.

Seems to be working now.

Need to update makemkv
  • sudo apt-get install build-essential libc6-dev libssl-dev libexpat1-dev libgl1-mesa-dev libqt4-dev
    • no changes
  • cd makemkv-oss-1.7.7
  • make -f makefile.linux
  • sudo make -f makefile.linux install
  • cd ..\makemkv-bin-1.7.7
  • make -f makefile.linux
  • sudo make -f makefile.linux install





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