Please note that this bug report is 7 years old. Since then Ubuntu has switched from OO to LO. The sync of the current libreoffice-dictionaries version in Debian will be considered a fix of this bug.
I can't tell if there is a particular mechanism in place to handle the possible conflict you mention. I imagine that if you for example download hunspell-gd from the LO site, you'd better uninstall the hunspell-gd package before installing the other spellchecker. To the extent this is an issue, it's not a new issue triggered by the fix of this bug.
In general, the Ubuntu distribution can't take responsibility for software which users download from external sites.
Please note that this bug report is 7 years old. Since then Ubuntu has switched from OO to LO. The sync of the current libreoffice- dictionaries version in Debian will be considered a fix of this bug.
I can't tell if there is a particular mechanism in place to handle the possible conflict you mention. I imagine that if you for example download hunspell-gd from the LO site, you'd better uninstall the hunspell-gd package before installing the other spellchecker. To the extent this is an issue, it's not a new issue triggered by the fix of this bug.
In general, the Ubuntu distribution can't take responsibility for software which users download from external sites.