Remediating an ESXi 5.x and 6.0 host with Update Manager fails with the error: There was an error checking file system on altbootbank

To resolve the issue, repair the altbootbank partition.

To repair the altbootbank partition:

    Run this command to determine the device for /altbootbank:
    vmkfstools -P /altbootbank

    You see output similar to:
    mpx.vmhba32:C0:T0:L0:5

    Run this command to repair the altbootbank filesystem:
    dosfsck -a -w /dev/disks/device_name
For example:
    dosfsck -a -w /dev/disks/mpx.vmhba32:C0:T0:L0:5

    If remediation fails at this stage, reboot the host.