According to user reports, after the download is completed, Windows doesn’t boot in the first re-boot phase. Instead, a message appears, informing users the system is going to enter the GRUB rescue mode: error: unknown filesystem. Entering rescue mode … grub rescue> At the end of the process, the GRUB rescue utility lists the partitions, but shows them all as “unknown filesystem”. Many users would rush in to say it’s normal to have this error message since Linux and GRUB Boot Loader are not supported in dual boot configurations with Windows. In reality, many users have been running Grub with Linux and Windows for years.

Anniversary Update is destroying boot loader in dual-boot config

Fortunately, all hope is not lost as the boot-repair Ubuntu utility can fix this issue. You can download this free tool from Ubuntu’s website. My system was set up with a single drive, a 160GB SSD, with Windows 10 Home Edition installed in one partition, and Ubuntu 16.04 LTS in a separate partition. When Ubuntu is installed, it installs the GRUB bootloader, which up till now has had no problem handling Windows and Ubuntu installed on the same drive; it gives me a boot menu that allows me to select which OS to boot (Ubuntu selected as the default). However, after the Anniversary update, all I got was the above ‘unknown filesystem message’.

How to repair boot loader error in Linux and Windows dual-boot configuration

sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update sudo apt-get install -y boot-repair && boot-repair 4. Launch Boot-Repair from either the Dash or by typing boot-repair in a terminal. 5. Click on the Recommended repair button. When the repair process is finished, note the URL (paste.ubuntu.com/XXXXX) on a piece of paper. 6. Reboot > check if your dual-boot OS has recovered. RELATED STORIES YOU NEED TO CHECK OUT:

Fix: 0xC1900101 – 0x20017 Anniversary Update error Fix: Apps crash after Windows 10 Anniversary Update install Fix: Windows 10 won’t wake up from sleep after the Anniversary Update

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