I use /acs-admin/install/install?upgrade_p=1 instead of acs-admin/apm/packages-install because "Install Software" link in Main Admin Page (acs-admin). So I think that the only reason may be lazyness 😊
I've just tried using acs-admin/apm/packages-install and Kernel was installed correctly but after that, when It was installing acs-tcl same error occurred.
I also realized that my Kernel version was Kernel 5.5.0d6 (not 5.5.1) so I did a Kernel upgrade (to 5.5.1) and tried again but ... same error
BUT I'll tried again with these strategy ( I have read that it is the recommended way but my lazyness comes out 😊 ).
I'll do an "Upgrade from repository" to get my dev server to 5.7. And, after that I'll try again with "Upgrade from local" to get 5.8.0 work.
I'll keep you informed to know what it the "general solution" (I think it could be "have a minimum X version installed").
If you want to look for testing an "straight upgrade from 5.5.1 to 5.8" I can do it with my dev server.
