Grub cannot find system partitions table when restoring backup - Ubuntu 18.04












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I was recently trying to backup my Ubuntu server using this guide. I am restoring a backup of my entire server from the / directory using a tar.gz compressed file. The guide worked up until the last step involving restoration, when I tried restoring grub from Ubuntu Live using the command "dpkg-reconfigure grub-pc". I get an error message in the terminal saying: "Cannot find list of partitions! Try mounting /sys." I tried mounting /sys but when I try running the command it says /sys is already mounted.



When I unplug the USB and reboot Grub menu appears, and I can login to my server backup using the old username and password, however after logging in I find that everything has read only file permissions, and none of the original user permissions are stored, so essentially the whole system is broken.



I went into Live Ubuntu, reformatted my /dev/sda2 partition with gparted, and then restored my tar.gz backup using the following commands:



sudo mkdir /media/backup
sudo mount /dev/sda2 /media/backup
sudo tar -xvpzf /path/to/backup.tar.gz -C /media/backup --numeric-owner



sudo -s
for f in dev dev/pts proc ; do mount --bind /$f /media/whatever/$f ; done
chroot /media/whatever
dpkg-reconfigure grub-pc



Any idea what I am doing wrong?










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    I was recently trying to backup my Ubuntu server using this guide. I am restoring a backup of my entire server from the / directory using a tar.gz compressed file. The guide worked up until the last step involving restoration, when I tried restoring grub from Ubuntu Live using the command "dpkg-reconfigure grub-pc". I get an error message in the terminal saying: "Cannot find list of partitions! Try mounting /sys." I tried mounting /sys but when I try running the command it says /sys is already mounted.



    When I unplug the USB and reboot Grub menu appears, and I can login to my server backup using the old username and password, however after logging in I find that everything has read only file permissions, and none of the original user permissions are stored, so essentially the whole system is broken.



    I went into Live Ubuntu, reformatted my /dev/sda2 partition with gparted, and then restored my tar.gz backup using the following commands:



    sudo mkdir /media/backup
    sudo mount /dev/sda2 /media/backup
    sudo tar -xvpzf /path/to/backup.tar.gz -C /media/backup --numeric-owner



    sudo -s
    for f in dev dev/pts proc ; do mount --bind /$f /media/whatever/$f ; done
    chroot /media/whatever
    dpkg-reconfigure grub-pc



    Any idea what I am doing wrong?










    share|improve this question







    New contributor




    solipsist1212 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























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      0








      I was recently trying to backup my Ubuntu server using this guide. I am restoring a backup of my entire server from the / directory using a tar.gz compressed file. The guide worked up until the last step involving restoration, when I tried restoring grub from Ubuntu Live using the command "dpkg-reconfigure grub-pc". I get an error message in the terminal saying: "Cannot find list of partitions! Try mounting /sys." I tried mounting /sys but when I try running the command it says /sys is already mounted.



      When I unplug the USB and reboot Grub menu appears, and I can login to my server backup using the old username and password, however after logging in I find that everything has read only file permissions, and none of the original user permissions are stored, so essentially the whole system is broken.



      I went into Live Ubuntu, reformatted my /dev/sda2 partition with gparted, and then restored my tar.gz backup using the following commands:



      sudo mkdir /media/backup
      sudo mount /dev/sda2 /media/backup
      sudo tar -xvpzf /path/to/backup.tar.gz -C /media/backup --numeric-owner



      sudo -s
      for f in dev dev/pts proc ; do mount --bind /$f /media/whatever/$f ; done
      chroot /media/whatever
      dpkg-reconfigure grub-pc



      Any idea what I am doing wrong?










      share|improve this question







      New contributor




      solipsist1212 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I was recently trying to backup my Ubuntu server using this guide. I am restoring a backup of my entire server from the / directory using a tar.gz compressed file. The guide worked up until the last step involving restoration, when I tried restoring grub from Ubuntu Live using the command "dpkg-reconfigure grub-pc". I get an error message in the terminal saying: "Cannot find list of partitions! Try mounting /sys." I tried mounting /sys but when I try running the command it says /sys is already mounted.



      When I unplug the USB and reboot Grub menu appears, and I can login to my server backup using the old username and password, however after logging in I find that everything has read only file permissions, and none of the original user permissions are stored, so essentially the whole system is broken.



      I went into Live Ubuntu, reformatted my /dev/sda2 partition with gparted, and then restored my tar.gz backup using the following commands:



      sudo mkdir /media/backup
      sudo mount /dev/sda2 /media/backup
      sudo tar -xvpzf /path/to/backup.tar.gz -C /media/backup --numeric-owner



      sudo -s
      for f in dev dev/pts proc ; do mount --bind /$f /media/whatever/$f ; done
      chroot /media/whatever
      dpkg-reconfigure grub-pc



      Any idea what I am doing wrong?







      grub2 partitioning data-recovery tar






      share|improve this question







      New contributor




      solipsist1212 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







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      solipsist1212 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






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      asked Mar 9 at 9:50









      solipsist1212solipsist1212

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