Hi, I am trying Disk Image Builder and followed initial instructions given in DIB documentation. I tried creating basic ubuntu image with 'disk-image-create ubuntu vm" command. I am executing this on CentOS7 server installation on virtual box machine on my laptop. I am getting following error - 2020-07-22 14:38:38.181 | INFO diskimage_builder.block_device.utils [-] Calling [sudo sync] 2020-07-22 14:38:38.480 | INFO diskimage_builder.block_device.utils [-] Calling [sudo fstrim --verbose /tmp/dib_build.kjzn9JEP/mnt/] 2020-07-22 14:38:38.692 | INFO diskimage_builder.block_device.utils [-] Calling [sudo umount /tmp/dib_build.kjzn9JEP/mnt/] 2020-07-22 14:38:38.969 | INFO diskimage_builder.block_device.utils [-] Calling [sudo kpartx -d /dev/loop0] 2020-07-22 14:38:38.986 | Traceback (most recent call last): 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/bin/dib-block-device", line 8, in <module> 2020-07-22 14:38:38.986 | sys.exit(main()) 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 120, in main 2020-07-22 14:38:38.986 | return bdc.main() 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 115, in main 2020-07-22 14:38:38.986 | self.args.func() 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 39, in cmd_umount 2020-07-22 14:38:38.986 | self.bd.cmd_umount() 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/blockdevice.py", line 442, in cmd_umount 2020-07-22 14:38:38.986 | node.umount() 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/level1/partition.py", line 88, in umount 2020-07-22 14:38:38.986 | self.partitioning.umount() 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/level1/partitioning.py", line 228, in umount 2020-07-22 14:38:38.986 | self.state['blockdev'][self.base]['device']]) 2020-07-22 14:38:38.986 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/utils.py", line 143, in exec_sudo 2020-07-22 14:38:38.986 | raise e 2020-07-22 14:38:38.987 | diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed 2020-07-22 14:38:39.974 | INFO diskimage_builder.block_device.level3.mount [-] Called for [mount_mkfs_root] 2020-07-22 14:38:39.974 | INFO diskimage_builder.block_device.utils [-] Calling [sudo sync] 2020-07-22 14:38:40.086 | INFO diskimage_builder.block_device.utils [-] Calling [sudo fstrim --verbose /tmp/dib_build.kjzn9JEP/mnt/] 2020-07-22 14:38:40.101 | Traceback (most recent call last): 2020-07-22 14:38:40.101 | File "/root/dib-virtualenv/bin/dib-block-device", line 8, in <module> 2020-07-22 14:38:40.101 | sys.exit(main()) 2020-07-22 14:38:40.101 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 120, in main 2020-07-22 14:38:40.101 | return bdc.main() 2020-07-22 14:38:40.101 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 115, in main 2020-07-22 14:38:40.101 | self.args.func() 2020-07-22 14:38:40.101 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/cmd.py", line 39, in cmd_umount 2020-07-22 14:38:40.102 | self.bd.cmd_umount() 2020-07-22 14:38:40.102 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/blockdevice.py", line 442, in cmd_umount 2020-07-22 14:38:40.102 | node.umount() 2020-07-22 14:38:40.102 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/level3/mount.py", line 111, in umount 2020-07-22 14:38:40.102 | self.state['mount'][self.mount_point]['path']]) 2020-07-22 14:38:40.102 | File "/root/dib-virtualenv/lib/python2.7/site-packages/diskimage_builder/block_device/utils.py", line 143, in exec_sudo 2020-07-22 14:38:40.102 | raise e 2020-07-22 14:38:40.102 | diskimage_builder.block_device.exception.BlockDeviceSetupException: exec_sudo failed Can you please help me understand issue here? Thanks, Prakash