I get

:~$ sage --package create fricas --version 1.2.7 --tarball 
fricas-1.2.7.tar.bz2 --type experimental
ERROR [cmdline|run:74]: unknown subcommand: create

with

┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 7.3.beta4, Release Date: 2016-06-12               │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable.     ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Do I need to upgrade sage first?

Martin

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