/usr/share/texmf/tex4ht/ht-fonts/symbol/ is in tex4ht-common 20090611-1.1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/texmf/tex4ht/ht-fonts/symbol/charset/
/usr/share/texmf/tex4ht/ht-fonts/symbol/charset/unicode.4hf
/usr/share/texmf/tex4ht/ht-fonts/symbol/cyrillic/
/usr/share/texmf/tex4ht/ht-fonts/symbol/cyrillic/xcmr.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/cyrillic/xcmti.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/hebrew/
/usr/share/texmf/tex4ht/ht-fonts/symbol/hebrew/hclassic.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/blex-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/blmi-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/blsy-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/mtex-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/mtmi-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/mtsy-bs.htf
/usr/share/texmf/tex4ht/ht-fonts/symbol/mathtime/mtsyn-bs.htf