my laptop is intel pentium cpu compaq cq57 32bit.I run kali linux rolling version 4.8.0. During upgrade a power blackout occurred. on rebooting, the boot process gets stuck at  a start job is running for udev kernel device manager. after 1min 30 sec of unsuccessful run, it outputs dependency failure on swap. the partition is /dev/sda5. I append rw init=/bin/bash to my kernel and hit ctrl+x at my grub2 menu. it boots to shell root@(none):. i try to run dpkg --configure -a to solve package issues. boot still fails at the same stage.I examine my fstab to cross check uuid for my swap n disks with the output of blkid. They match. I run free command and swap space is 0 0. I run swapon to mount it. free outputs the 3.7gb size. I reboot again. it fails again.I perform fdisk -d to delete the partition. create it again and perform mkfs.ext4 on it. mkswap and swapon. paste the new uuid in fstab. reboot still fails at the same stage. commenting out the line doesnt help either. Is there a solution to this where i dont lose my documents? 
udev systemd swap dependency boot upgrade kali linux
boot;systemd;kali linux;udev