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After removing a package from tasksel all other package also removed

us flag
  • Ubuntu server 20 After I ran sudo apt tasksel mail-server

All other software packages installed by the tasksel are gone. Even no network, not able connect to internet and install any other software.

It's really frustrating. What's wrong in the command how can I fix network problem and install softwares.

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cn flag
Ubuntu releases that use the *year* format are *snap* only, eg. Ubuntu Core 20 (Server) cannot use the *deb* packages thus `apt` commands give errors. Ubuntu 20.04 LTS (Server) however can. Ubuntu server 20 systems are different products to 20.04.
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