我在 Ubuntu Studio 18.04 LTS 中收到此错误。由于我无法更新我的系统，我可以做些什么来修复它。
"E: Malformed entry 52 in list file /etc/apt/sources.list (Component)"
cat /etc/apt/sources.list
# deb cdrom:[Ubuntu-Studio 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://in.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://in.archive.ubuntu.com/ubuntu/ bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://in.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://in.archive.ubuntu.com/ubuntu/ …18.04 ×1