Multiple users including myself are experiencing this. I also do not know the source of the problem. I first noticed it yesterday, also using apt 2.1.1. There are others discussing it on the debian-users mailing list ([1]), with some insight into the source of the strings the errors refer to at least.
[1]: https://www.mail-archive.com/debian-user@lists.debian.org/msg756341.html On Wed, 13 May 2020 18:35:00 +0200 Nicolas Patrois < nicolas.patr...@gmail.com> wrote: > Package: apt > Version: 2.1.1 > Severity: normal > > Dear Maintainer, > > I don’t know if it is an apt bug or not. > Just after having read the sources, apt complains about malformed XML files: > > Entity: line 4: parser error : xmlParseEntityRef: no name > e original message barList of languages in a config file instead iso- codesFind > & > ^ > Entity: line 8: parser error : EntityRef: expecting ';' > - get haircut @s 24 @r d &i 14 @o r</li> > ^ > Entity: line 11: parser error : EntityRef: expecting ';' > @r y &i 4 &M 11 &m 2, 3, 4, 5, 6, 7, 8 &w TU</li> > ^ > Entity: line 11: parser error : EntityRef: expecting ';' > @r y &i 4 &M 11 &m 2, 3, 4, 5, 6, 7, 8 &w TU</li> > ^ > Entity: line 11: parser error : EntityRef: expecting ';' > @r y &i 4 &M 11 &m 2, 3, 4, 5, 6, 7, 8 &w TU</li> > ^ > Entity: line 11: parser error : EntityRef: expecting ';' > @r y &i 4 &M 11 &m 2, 3, 4, 5, 6, 7, 8 &w TU</li> > ^