admin@ip-172-31-45-128:~/cb-non-package-installer$ dpkg --info ../couchbase-server-enterprise_6.6.0-7860-debian10_amd64.deb
new Debian package, version 2.0.
size 350580040 bytes: control archive=399360 bytes.
938 bytes, 20 lines control
374595 bytes, 3538 lines md5sums
4362 bytes, 124 lines * postinst #!/bin/sh
822 bytes, 26 lines * postrm #!/bin/sh
4053 bytes, 145 lines * preinst #!/bin/sh
630 bytes, 12 lines * prerm #!/bin/sh
Package: couchbase-server
Version: 6.6.0-7860-1
Architecture: amd64
Maintainer: Couchbase <support@couchbase.com>
Installed-Size: 866126
Depends: libc6 (>= 2.28), libtinfo6 (>= 6), lsb-base (>= 3.2), bzip2, tar
Breaks: couchbase-server-community, couchbase-server-enterprise-no-jre, membase-server
Replaces: membase-server
Section: web
Priority: extra
Homepage: http://couchbase.com
Description: Couchbase Server
Couchbase is the company behind the Couchbase open source project, a
vibrant community of developers and users of Couchbase
document-oriented database technology. Our flagship product, Couchbase
Server, is a packaged version of Couchbase technology that's available
in Community and Enterprise Editions. We're known for our easy
scalability, consistent high performance, 24x365 availability, and a
flexible data model. Read more about Couchbase Server here -
http://www.couchbase.com/nosql-databases/couchbase-server

This fixes it: http://review.couchbase.org/c/cb-non-package-installer/+/131863

admin@ip-172-31-45-128:~/cb-non-package-installer$ ./cb-non-package-installer --install --install-location ../couchbase-home/ --package ../couchbase-server-enterprise_6.6.0-7860-debian10_amd64.deb
Successfully installed

Build python_tools::cb-non-package-installer-6.6.0-7 contains cb-non-package-installer commit 991ff30 with commit message:
MB-40279 Fixing libtinfo dependency issue in debian10