I, too, am having this issue when attempting to upgrade from 24.4.5 to 26.04.1.
Here is the list of packages:
ffmpeg...................Installed from: UbuntuESMApps
go-mtpfs.................Installed from: unknown origin
imagemagick..............Installed from: UbuntuESMApps
libass9..................Installed from: UbuntuESMApps
libde265-0...............Installed from: UbuntuESMApps
libimage-magick-perl.....Installed from: UbuntuESMApps
libimage-magick-q16-perl.Installed from: UbuntuESMApps
libopenexr-3-1-30........Installed from: UbuntuESMApps
libqt5webengine-data.....Installed from: UbuntuESMApps
libqt5webengine5.........Installed from: UbuntuESMApps
libqt5webenginecore5.....Installed from: UbuntuESMApps
libqt5webenginewidgets5..Installed from: UbuntuESMApps
libsoup-2.4-1............Installed from: UbuntuESMApps
libsoup2.4-common........Installed from: UbuntuESMApps
libsrt1.5-gnutls.........Installed from: UbuntuESMApps
python3-pip..............Installed from: UbuntuESMApps
python3-pip-whl..........Installed from: UbuntuESMApps
python3-urwid............Installed from: UbuntuESMApps
qml-module-qtwebengine...Installed from: UbuntuESMApps
The one listed as from "unknown origin" is a dependency of kubuntu-
desktop.
~ apt-cache rdepends go-mtpfs
go-mtpfs
Reverse Depends:
kubuntu-desktop
kubuntu-desktop
ubuntustudio-desktop
ubuntu-budgie-desktop
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https://bugs.launchpad.net/bugs/2133872
Title:
Unable to upgrade to 26.04 - foreign packages installed
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