A start job is running for dev-disk-by\x2duuid-db1d2b48

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If anyone getting error “A start job is running for dev-disk-by” while boot or reboot VM it means there is a problem in /etc/fstab

Full error message like :
After a full system upgrade I got following message, which was blocking the startup for 1 min and 30 secs:

A start job is running for dev-disk-by\x2duuid-db1d2b48\x2d0cfb\x2d4bdf\x2dabe8\x2dfb287a4274d5.device

How to Analysis Problem

1) Check fstab entry right ?

cat /etc/fstab 

$/dev/sda3 LABEL=archlinux
UUID=dec6257b-e136-47b6-c3b5-8bcd5b749193       /               ext4            defaults,data=ordered   0 1
# /dev/sda4
UUID=fb1c1b47-0efb-2bcf-abce8-fe227a3214d5       none            swap            defaults        0 0
/dev/sda2       /mnt/backup    ntfs-3g defaults,uid=melladric,gid=users,umask=0022     0       0

2) Check UUID using command : lsblk -f

$ lsblk -f
 NAME   FSTYPE LABEL     UUID                                 MOUNTPOINT
 sda                                                          
   sda1 ntfs   SYSTEM    3436F2D494F29787                     
   sda2 ntfs             A06C17246C66F45E                     /mnt/backup
   sda3 swap             a7fa69a8-31bd-448c-98de-55de4aa6f06a 
   sda4 ext4   archlinux dec6257b-e136-47b6-c3b5-8bcd5b749193 /

Now verify that which UUID in fstab is incorrect!

In my case Swap UUID in fstab is incorrect. I corrected entry in /etc/fstab and solved the problem.
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