sudo apt-get install crystal fails on standard Bash on Ubuntu/Win10

crystal-fail.txt

user@MSEDGEWIN10:/mnt/c/Windows/System32$ sudo apt-get install crystal

sudo: unable to resolve host MSEDGEWIN10
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libfreetype6 os-prober
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
  crystal
0 upgraded, 1 newly installed, 0 to remove and 32 not upgraded.
Need to get 16.9 MB of archives.
After this operation, 54.6 MB of additional disk space will be used.
Fetched 16.9 MB in 14s (1,163 kB/s)
Selecting previously unselected package crystal.
(Reading database ... 26399 files and directories currently installed.)
Preparing to unpack .../crystal_0.19.4-1_amd64.deb ...
You're about to install crystal!
Unpacking crystal (0.19.4-1) ...
dpkg: error processing archive /var/cache/apt/archives/crystal_0.19.4-1_amd64.deb (--unpack):
 unable to open '/opt/crystal/embedded/bin/shards.dpkg-new': Permission denied
dmesg: klogctl failed: Function not implemented
                                               crystal has been uninstalled!
E: Sub-process /usr/bin/dpkg returned an error code (1)

I've sudo mkdir -p /opt/crystal/embedded/bin/ and reinstalled - and it worked.