So, I got this Dell Inspiron 15 laptop with Windows 10 a couple of months ago.
I installed Ubuntu 14.04 to have as dual boot since I rarely use Windows.
Today, I did an update and some grub related packages were kept.
I don't know what I was thinking but I went on and
sudo installed the kept back packages.
After reboot, I get an invalid signature error and I get redirected to a Windows boot.
Is there a way to rectify the situation? My knowledge of EFI, secure boot and their interaction is fairly limited (going through info pages as I write this).