我正在使用 Kubuntu。每次我打开 Discover，它都会立即崩溃。重新启动不起作用。唯一不会崩溃的情况是我断开计算机与互联网的连接。没有互联网，它也能正常工作。
如果您知道解决方案，请帮忙。请告诉我您诊断问题所需的其他信息。
sudo apt update输出”
> Hit:1 http://repo.steampowered.com/steam precise InRelease
> Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease
> Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
> Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease
> Hit:5 https://deb.opera.com/opera-stable stable InRelease
> Hit:6 https://repo.nordvpn.com/deb/nordvpn/debian stable InRelease
> Get:7 https://repo.skype.com/deb stable InRelease [4,502 B]
> Hit:8 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
> Err:7 https://repo.skype.com/deb stable InRelease The following
> signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client
> Repository <[email protected]> Fetched 4,502 B in 2s (2,526 B/s)
> Reading package lists... Done Building dependency tree Reading
> state information... Done All packages are up to date. W: An error
> occurred during the signature verification. The repository is not
> updated and the previous index files will be used. GPG error:
> https://repo.skype.com/deb stable InRelease: The following signatures
> were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository
> <[email protected]> W: Failed to fetch
> https://repo.skype.com/deb/dists/stable/InRelease The following
> signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client
> Repository <[email protected]> W: Some index files failed to
> download. They have been ignored, or old ones used instead.
sudo apt upgrade输出：
> Reading package lists... Done Building dependency tree Reading
> state information... Done Calculating upgrade... Done The following
> packages were automatically installed and are no longer required:
> dconf-cli eqonomize-doc ipset khelpcenter4 kmymoney-common
> libalgorithm-c3-perl libalkimia5-7 libaqbanking-data libaqbanking35
> libaqbanking35-plugins libaqebics0 libaqhbci24 libaqofxconnect7
> libb-hooks-endofscope-perl libb-hooks-op-check-perl libcgi-fast-perl
> libcgi-pm-perl libclass-c3-perl libclass-c3-xs-perl
> libclass-data-inheritable-perl libclass-inspector-perl
> libclass-method-modifiers-perl libclass-singleton-perl
> libcommon-sense-perl libdata-optlist-perl libdatetime-locale-perl
> libdatetime-perl libdatetime-timezone-perl libdevel-callchecker-perl
> libdevel-caller-perl libdevel-lexalias-perl libdevel-stacktrace-perl
> libdynaloader-functions-perl libeb16 libeval-closure-perl
> libexception-class-perl libfcgi-perl libfile-sharedir-perl
> libfinance-quote-perl libglade2-0 libgwengui-cpp0 libgwengui-qt5-0
> libgwenhywfar-data libgwenhywfar60 libhtml-tableextract-perl libipset3
> libjson-perl libjson-xs-perl libkchart2 libkchart2-l10n
> libktoblzcheck1v5 libllvm9 libllvm9:i386
> libmodule-implementation-perl libmodule-runtime-perl
> libmro-compat-perl libnamespace-autoclean-perl libnamespace-clean-perl
> libnvidia-cfg1-435 libnvidia-cfg1-455 libnvidia-common-435
> libnvidia-common-455 libnvidia-compute-435 libnvidia-compute-435:i386
> libnvidia-compute-455 libnvidia-compute-455:i386
> libnvidia-decode-435 libnvidia-decode-435:i386 libnvidia-decode-455
> libnvidia-decode-455:i386 libnvidia-encode-435
> libnvidia-encode-435:i386 libnvidia-encode-455
> libnvidia-encode-455:i386 libnvidia-fbc1-435 libnvidia-fbc1-435:i386
> libnvidia-fbc1-455 libnvidia-fbc1-455:i386 libnvidia-gl-435
> libnvidia-gl-435:i386 libnvidia-gl-455 libnvidia-gl-455:i386
> libnvidia-ifr1-435 libnvidia-ifr1-435:i386 libnvidia-ifr1-455
> libnvidia-ifr1-455:i386 libpackage-stash-perl libpackage-stash-xs-perl
> libpadwalker-perl libparams-classify-perl libparams-util-perl
> libparams-validationcompiler-perl libreadonly-perl libref-util-perl
> libref-util-xs-perl librole-tiny-perl libspecio-perl
> libsub-exporter-perl libsub-exporter-progressive-perl
> libsub-identify-perl libsub-install-perl libsub-quote-perl libtidy5
> libtypes-serialiser-perl libvariable-magic-perl
> linux-headers-5.4.0-65-generic linux-hwe-5.4-headers-5.4.0-42
> linux-hwe-5.4-headers-5.4.0-45 linux-hwe-5.4-headers-5.4.0-48
> linux-hwe-5.4-headers-5.4.0-65 linux-image-5.4.0-65-generic
> linux-modules-5.4.0-65-generic linux-modules-extra-5.4.0-65-generic
> nvidia-compute-utils-435
> nvidia-compute-utils-455 nvidia-dkms-435 nvidia-dkms-455
> nvidia-kernel-common-435 nvidia-kernel-common-455
> nvidia-kernel-source-435 nvidia-kernel-source-455
> nvidia-utils-435 nvidia-utils-455 python-asn1crypto python-bs4
> python-cairo python-certifi python-cffi-backend python-chardet
> python-crypto python-cryptography python-cssselect
> python-dateutil python-enum34 python-feedparser python-gdata
> python-glade2 python-gobject-2 python-gtk2 python-html5lib python-idna
> python-ipaddress python-libxml2 python-lxml python-mechanize
> python-olefile python-openssl python-pil python-pkg-resources
> python-requests python-six python-urllib3 python-utidylib
> python-webencodings python-weboob python-yaml
> xserver-xorg-video-nvidia-435 xserver-xorg-video-nvidia-455 xsltproc
> Use 'sudo apt autoremove' to remove them.
> 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.