Envie um relatório de bug para o acestream, o pacote acestream-engine está corrompido. python2.7-apsw não existe no sid debian. o pacote em que eles devem estar dependendo é chamado python-apsw .
Como alternativa (ou adicionalmente), você pode usar o pacote debian equivs para criar um pacote python2.7-apsw fictício sem conteúdo, mas que depende de python-apsw
Package: equivs
Description-en: Circumvent Debian package dependencies
This package provides a tool to create trivial Debian packages.
Typically these packages contain only dependency information, but they
can also include normal installed files like other packages do.
.
One use for this is to create a metapackage: a package whose sole
purpose is to declare dependencies and conflicts on other packages so
that these will be automatically installed, upgraded, or removed.
.
Another use is to circumvent dependency checking: by letting dpkg
think a particular package name and version is installed when it
isn't, you can work around bugs in other packages' dependencies.
(Please do still file such bugs, though.)