Boot-Repair is a simple tool to repair frequent boot issues you may encounter in Ubuntu like when you can't boot Ubuntu after installing Windows or another Linux distribution, or when you can't boot Windows after installing Ubuntu, or when GRUB is not displayed anymore, some upgrade breaks GRUB, etc.
Boot-Repair lets you fix these issues with a simple click, which (generally reinstalls GRUB and) restores access to the operating systems you had installed before the issue.
Boot-Repair also has advanced options to back up table partitions, back up bootsectors, create a Boot-Info (to get help by email or forum), or change the default repair parameters: configure GRUB, add kernel options (acpi=off ...), purge GRUB, change the default OS, restore a Windows-compatible MBR, repair a broken filesystem, specify the disk where GRUB should be installed, etc.
Boot-Repair is a free software, licensed under GNU-GPL.
There is an old PPA available however it has not been kept update with items like EUFI/Encryption and possibly more.
Getting Boot-Repair
get a disk including Boot-Repair
The easiest way to use Boot-Repair is to burn one of the following disks and boot on it.
Boot-Repair-Disk is a disk starting Boot-Repair automatically. The instructions for use are also here.
Boot-Repair is also included in Linux-Secure-Remix and various other distributions.
Remark : you can also install the ISO on a live-USB (eg via UnetBootin or LiliUSB or Universal USB Installer).
Advanced options
Warning: the default settings are the ones used by the "Recommended Repair". Changing them may worsen your problem. Don't modify them before creating a BootInfo URL, and asking for advice on Ubuntu Forums Absolute Beginners Section or in Installation and Upgrades.
External Links
Topic "Boot-repair: Graphical tool to repair the PC boot in 1 click !" - on Ubuntu forum, for any questions/comments.