1) It's a bug, but it's probably a bug in Debian's libxml2 (Doitsu may be able to help here)
2) See #1 for the doubling part (athough conversion of entities to characters when editing in book view is NOT a bug. That's the way it works on all platforms. Enter the entities you want to preserve in Sigil's Preserve Entities preference.
In the future, please report bugs connected to unofficial binary versions of Sigil in the threads where those unofficial binaries are made available.
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