I have Windows 10 installed on SSD (240GB plugged in sata express slot) and then I have plugged M.2 SSD (240GB) to install Ubuntu 18.04 on it. In the end of installing Ubuntu 18.04 the setup program gives message about failing to install bootloader. GParted shows initial partitions including Windows on /dev/sdb and Ubuntu related partition - on /dev/sda. I have googled and looked through some articles about dual booting but I have no idea how to solve this issue.
Thanks in advance.
It looks like the Ubuntu installer failed to install the grub bootloader because there isn't a 500 MB FAT32-formatted EFI System partition on /dev/sda (M.2 240GB SSD). If the Ubuntu installer did not create this EFI System partition the first time, then you can select Try Ubuntu and use the built-in GParted partition editor to create a 500MB EFI System partition formatted as FAT32 at the start of disk /dev/sda manually. Then run the Ubuntu installer again. If the Ubuntu installation is successful, the Ubuntu installer will run all the way through the installation this time including installing the grub bootloader.
