Try the following:

dpkg-checkbuilddeps 2>&1 | sed 's/dpkg-checkbuilddeps:\serror:\sUnmet build dependencies: //g' | sed 's/[\(][^)]*[\)] //g'

First of all, dpkg-checkbuilddeps prints out the error to stderr not stdout. So it needs to be redirected to stdout to use pipeline.

Here is how to Redirect stderr and stdout in Bash

You used the regex ([^)]*) on:

sed 's/([^)]*)//g'

But it should be:

sed 's/[\(][^)]*[\)] //g'

Reference: Using sed to delete a string between parentheses

Try the following:

dpkg-checkbuilddeps 2>&1 | sed 's/dpkg-checkbuilddeps:\serror:\sUnmet build dependencies: //g' | sed 's/[\(][^)]*[\)] //g'

First of all, dpkg-checkbuilddeps prints out the error to stderr not stdout. So it needs to be redirected to stdout to use pipeline.

Here is how to Redirect stderr and stdout in Bash

You used the regex ([^)]*) on:

sed 's/([^)]*)//g'

But it should be:

sed 's/[\(][^)]*[\)]//g'

Reference: Using sed to delete a string between parentheses

Try

dpkg-checkbuilddeps 2>&1 | sed 's/dpkg-checkbuilddeps:\serror:\sUnmet build dependencies: //g' | sed 's/[(][^)]*[)] //g'

First of all, dpkg-checkbuilddeps prints out the error to stderr not stdout. So it needs to be redirected to stdout to use pipeline.

Redirect stderr and stdout in Bash https://stackoverflow.com/questions/637827/redirect-stderr-and-stdout-in-bash

You used the regex ([^)]*) on

sed 's/([^)]*)//g'

But it should be

sed 's/[(][^)]*[)] //g'

https://stackoverflow.com/questions/27825977/using-sed-to-delete-a-string-between-parentheses

Try the following:

dpkg-checkbuilddeps 2>&1 | sed 's/dpkg-checkbuilddeps:\serror:\sUnmet build dependencies: //g' | sed 's/[\(][^)]*[\)] //g'

First of all, dpkg-checkbuilddeps prints out the error to stderr not stdout. So it needs to be redirected to stdout to use pipeline.

Here is how to Redirect stderr and stdout in Bash

You used the regex ([^)]*) on:

sed 's/([^)]*)//g'

But it should be:

sed 's/[\(][^)]*[\)] //g'

Reference: Using sed to delete a string between parentheses