Please help identify on which partition I have ubuntu installed

Please help identify on which partition I have ubuntu installed

I need to reinstall my GRUB since I cannot boot windows 8 anymore
(something happened with my installation of Ubuntu). I want to follow this
advice - Boot error > no such device: grub rescue in order to re-install
the grub but I made the stupid mistake of allocating half of the size of
the partition to windows and half to Ubuntu lol. So now I need to know on
which partition I have Linux could someone help me out ? Thanks. Here is
the partition list
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 718847 358400 7 HPFS/NTFS/exFAT
/dev/sda2 718848 1025779711 512530432 7 HPFS/NTFS/exFAT
/dev/sda3 1025779712 1851121663 412670976 7 HPFS/NTFS/exFAT
/dev/sda4 1851121664 1953521663 51200000 f W95 Ext'd (LBA)
/dev/sda5 1851123712 1953521663 51198976 7 HPFS/NTFS/exFAT