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Thread: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

  1. #1
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    Aug 2013
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    Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    So I am trying to install ubuntu on my work pc and it says the following:

    Code:
    The installer has detected that the following disks have mounted partitions:
    
    /dev/sda, /dev/sdb
    
    Do you want the installer to try to unmount the partitions on these disks before continuing? If you leave them mounted, you will not be able to create, delete, or resize partitions on these disks, but you may be able to install to existing partitions there
    What is my best course of action?

  2. #2
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    Re: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    I am not sure you should be getting mounted partitions. Is Windows hibernated, is system RAID or some other special configuration?
    Post this from the live mode installer.

    sudo parted -l
    df -h

    I do that that same message, but I install from one hard drive to another and the partition with the ISO that I loopmount is mounted. But since I an not doing anything to that drive I do ignore message.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #3
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    Re: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    No RAID drives. This is the output I get:

    Code:
    ubuntu@ubuntu:~$ sudo parted -l
    Model: ATA V4-CT256V4SSD2 (scsi)
    Disk /dev/sda: 256GB
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos
    
    Number  Start   End    Size    Type     File system  Flags
     1      1049kB  840MB  839MB   primary  ntfs         boot
     2      840MB   249GB  248GB   primary  ntfs
     3      249GB   256GB  6708MB  primary  ntfs
     4      256GB   256GB  110MB   primary  fat32        diag
    
    
    Model: ATA WDC WD10EZEX-00R (scsi)
    Disk /dev/sdb: 1000GB
    Sector size (logical/physical): 512B/4096B
    Partition Table: msdos
    
    Number  Start   End     Size    Type     File system  Flags
     1      1049kB  1000GB  1000GB  primary  ntfs
    
    
    Model: Chipsbnk UDisk (scsi)
    Disk /dev/sdc: 1993MB
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos
    
    Number  Start   End     Size    Type     File system  Flags
     1      16.4kB  1993MB  1993MB  primary  fat32        boot, lba
    Code:
    ubuntu@ubuntu:~$ df -h
    Filesystem      Size  Used Avail Use% Mounted on
    /cow             59M   30M   26M  55% /
    udev            7.8G  4.0K  7.8G   1% /dev
    tmpfs           1.6G  1.3M  1.6G   1% /run
    /dev/sdc1       1.9G  1.1G  854M  55% /cdrom
    /dev/loop0      939M  939M     0 100% /rofs
    none            4.0K     0  4.0K   0% /sys/fs/cgroup
    tmpfs           7.9G  1.1M  7.9G   1% /tmp
    none            5.0M     0  5.0M   0% /run/lock
    none            7.9G   76K  7.9G   1% /run/shm
    none            100M   60K  100M   1% /run/user
    /dev/loop1       59M   30M   26M  55% /media/ubuntu/casper-rw

  4. #4
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    Aug 2013
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    Re: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    My current plan:

    • Create new partitions on /dev/sda for Linux so that I have the following:
      • SYSTEM: 800MB NTFS
      • WINDOWS: 100GB NTFS
      • LINUX: 120GB EXT4
      • LINUX SWAP: 16GB EXT4


    This is all new to me, so I have some questions:


    1. Do you think the above partitions are suitable?
    2. Is the install error shown because there are already multiple partitions on /dev/sda?
    3. I will be transferring my projects to Linux so I should free up room on WINDOWS, will I be able to update the partitions in the future without too much hassle?
    4. I read that the LINUX SWAP partition should match the RAM - is that correct?

  5. #5
    Join Date
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    Re: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    You do have the 4 primary partition limit issue.

    Your partition plan is ok, but I prefer smaller system partitions for both Windows & Linux and larger data partition(s). I think what you show for Windows system is just its Boot partition which normally is 100MB. Then you have the main Windows or c: "drive". I would then add another NTFS for data only.

    Only if hibernating would you need swap equal to RAM in MiB, not MB. If you have 16GB, then you will not use swap at all. I might have 2 or 3GB just to have some. My 4GB RAM system has not used swap, but it does depend on how much you load into RAM at once. Linux does cache activity so RAM use may grow, but anything not recently used would be released for newer program you start to run.

    Is sdb internal or external? If Internal, I would consider installing Ubuntu to that drive.

    My laptop already has 4 primary partitions: how can I install Ubuntu?
    http://askubuntu.com/questions/14982...install-ubuntu
    Good advice on how to handle all four primary partitions used. - srs5694
    http://ubuntuforums.org/showthread.php?t=1686440
    Be sure to create recovery DVD(s) first. And a Windows repair CD.
    HP tools partition discussion - similar for other vendor utility partitions:
    http://h30434.www3.hp.com/t5/Noteboo...on/td-p/228360
    For a complete blow-by-blow on dealing with HP's four partitions, see Full Circle Magazine, issue 41, page 36. - gordintoronto
    http://fullcirclemagazine.org/


    Be sure to fully backup Windows and make a Windows repair CD or flash drive. Most Windows repairs must be done from Windows repair tools.

    https://help.ubuntu.com/community/DiskSpace

    All Linux and your data partitions can be logical partitions. Windows only requires a primary NTFS partition with the boot flag to boot.

    For the Total space you want for Ubuntu:
    Ubuntu's standard install is just / (root) & swap, but it is better to add another partition for /home if allocating over 30GB.:
    Ubuntu partitions - smaller root only where hard drive space is limited.
    If total space less than about 30GB just use / not separate /home or standard install.
    1. 10-25 GB Mountpoint / primary or logical beginning ext4
    2. all but 2 GB Mountpoint /home logical beginning ext4
    3. 2 GB Mountpoint swap logical

    Depending on how much memory you have you may not absolutely need swap but having some is still recommended. I do not hibernate (boots fast enough for me) but if hibernating then you need swap equal to RAM in GiB not GB. And if dual booting with windows a shared NTFS partition is also recommended. But you usually cannot create that as part of the install, just leave some space. Or partition in advance (recommended).
    One advantage of partitioning in advance is that the installer will use the swap space to speed up the install. Thanks Herman for the tip.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #6
    Join Date
    Aug 2013
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    Re: Windows 7 Ubuntu Dual Boot Installation with existing mounting partitions

    Quote Originally Posted by oldfred View Post
    You do have the 4 primary partition limit issue.
    If Windows lets me I am going to merge partitions #3 and #4 into the #2

    Quote Originally Posted by oldfred View Post
    Is sdb internal or external? If Internal, I would consider installing Ubuntu to that drive.
    It is internal but a very slow drive so I just use it as backup.

    Thanks for the info and links - just reading through them now to decide how to partition the hard disks.

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