我无法升级我的软件包，有 15 个软件包被阻止了。我不知道为什么会这样。这是我的 apt-sources.list：
# deb cdrom:[Kubuntu 21.10 _Impish Indri_ - Release amd64 (20211012)]/ impish main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://de.archive.ubuntu.com/ubuntu/ jammy main restricted
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates main restricted
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://de.archive.ubuntu.com/ubuntu/ jammy universe
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish universe
deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates universe
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://de.archive.ubuntu.com/ubuntu/ jammy multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish multiverse
deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://de.archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ impish-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu jammy-security main restricted
# deb-src http://security.ubuntu.com/ubuntu impish-security main restricted
deb http://security.ubuntu.com/ubuntu jammy-security universe
# deb-src http://security.ubuntu.com/ubuntu impish-security universe
deb http://security.ubuntu.com/ubuntu jammy-security multiverse
# deb-src http://security.ubuntu.com/ubuntu impish-security multiverse
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
希望这些信息对您有帮助。