Unable to install Bootcamp

I just gave that a try and got the following output:

MacBook-Pro:~ Mark$ sudo fsck_apfs -n -l /dev/rdisk1

Password:

** Checking the container superblock.

** Checking the EFI jumpstart record.

** Checking the space manager.

** Checking the space manager free queue trees.

** Checking the object map.

** Checking volume.

** Checking the APFS volume superblock.

** The volume Macintosh HD was formatted by hfs_convert (748.1.46) and last modified by apfs_kext (945.241.4).

** Checking the object map.

** Checking the snapshot metadata tree.

** Checking the snapshot metadata.

** Checking snapshot 1 of 11.

warning: inode_val: object (oid 0x1f95a9): invalid bsd_flags (0x10)

warning: found orphan dstream id object (id 162829350, refcnt 1)

warning: snapshot dstream corruptions are not repaired; they'll go away once the snapshot is deleted

warning: found orphan dstream id object (id 162829351, refcnt 1)

warning: found orphan dstream id object (id 162829352, refcnt 1)

warning: found orphan dstream id object (id 162829353, refcnt 1)

warning: found orphan dstream id object (id 162829354, refcnt 1)

too many warnings generated; suppressing subsequent ones.

** Checking snapshot 2 of 11.

** Checking snapshot 3 of 11.

** Checking snapshot 4 of 11.

** Checking snapshot 5 of 11.

** Checking snapshot 6 of 11.

** Checking snapshot 7 of 11.

** Checking snapshot 8 of 11.

** Checking snapshot 9 of 11.

** Checking snapshot 10 of 11.

** Checking snapshot 11 of 11.

** Checking the extent ref tree.

** Checking the fsroot tree.

** Checking volume.

** Checking the APFS volume superblock.

** The volume Preboot was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (945.241.4).

** Checking the object map.

** Checking the snapshot metadata tree.

** Checking the snapshot metadata.

** Checking the extent ref tree.

** Checking the fsroot tree.

** Checking volume.

** Checking the APFS volume superblock.

** The volume Recovery was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (945.241.4).

** Checking the object map.

** Checking the snapshot metadata tree.

** Checking the snapshot metadata.

** Checking the extent ref tree.

** Checking the fsroot tree.

** Checking volume.

** Checking the APFS volume superblock.

** The volume VM was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (945.230.6).

** Checking the object map.

** Checking the snapshot metadata tree.

** Checking the snapshot metadata.

** Checking the extent ref tree.

** Checking the fsroot tree.

** Verifying allocated space.

** Performing deferred repairs.

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

Remove orphan dstream id object? NO

** The volume /dev/rdisk1 appears to be OK.

Here are the results:

MacBook-Pro:~ Mark$ sudo tmutil listlocalsnapshots /

Password:

com.apple.TimeMachine.2019-01-29-100118

com.apple.TimeMachine.2019-01-29-110017

com.apple.TimeMachine.2019-01-29-120052

com.apple.TimeMachine.2019-01-29-140043

com.apple.TimeMachine.2019-01-29-150111

com.apple.TimeMachine.2019-01-29-160252

com.apple.TimeMachine.2019-01-29-170015

com.apple.TimeMachine.2019-01-29-190122

com.apple.TimeMachine.2019-01-29-203846

com.apple.TimeMachine.2019-01-29-223536

com.apple.TimeMachine.2019-01-30-070958

com.apple.TimeMachine.2019-01-30-084841

com.apple.TimeMachine.2019-01-30-094758

Just did that. It allowed me to partition my HD and install Bootcamp so problem solved. I appreciate all of your help.