$ at /etc/apt/sources.list

See https://www.kali.org/docs/general-use/kali-linux-sources-list-repositories/

deb http://http.kali.org/kali kali-rolling main contrib non-free

Additional line for source packages

deb-src http://http.kali.org/kali kali-rolling main contrib non-free

$ apt update
Get:1 http://kali.download/kali kali-rolling InRelease [41.5 kB]
Err:1 http://kali.download/kali kali-rolling InRelease
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[email protected]>
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
16 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://kali.download/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[email protected]>
W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[email protected]>
W: Some index files failed to download. They have been ignored, or old ones used instead.

$ pt-get dist-upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
freerdp2-x11 gtk2-engines-pixbuf libfreerdp-client2-2 libfreerdp2-2 libgtk2.0-0 libgtk2.0-common libwinpr2-2 libx11-6 libx11-data libx11-xcb1 libxml2
libxml2-utils metasploit-framework mimikatz python3-impacket starkiller
16 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 193 MB of archives.
After this operation, 99.3 kB of additional disk space will be used.
Do you want to continue? [Y/n]
Err:1 http://http.kali.org/kali kali-rolling/main amd64 freerdp2-x11 amd64 2.3.0+dfsg1-2
404 Not Found [IP: 18.211.24.19 80]
Err:2 http://http.kali.org/kali kali-rolling/main amd64 libfreerdp-client2-2 amd64 2.3.0+dfsg1-2
404 Not Found [IP: 18.211.24.19 80]
Err:3 http://http.kali.org/kali kali-rolling/main amd64 libfreerdp2-2 amd64 2.3.0+dfsg1-2
404 Not Found [IP: 18.211.24.19 80]
Err:4 http://http.kali.org/kali kali-rolling/main amd64 libwinpr2-2 amd64 2.3.0+dfsg1-2
404 Not Found [IP: 18.211.24.19 80]
Err:5 http://http.kali.org/kali kali-rolling/main amd64 libx11-xcb1 amd64 2:1.7.1-1
404 Not Found [IP: 18.211.24.19 80]
Err:6 http://http.kali.org/kali kali-rolling/main amd64 libx11-data all 2:1.7.1-1
404 Not Found [IP: 18.211.24.19 80]
Err:7 http://http.kali.org/kali kali-rolling/main amd64 libx11-6 amd64 2:1.7.1-1
404 Not Found [IP: 18.211.24.19 80]
Err:8 http://http.kali.org/kali kali-rolling/main amd64 gtk2-engines-pixbuf amd64 2.24.33-2
404 Not Found [IP: 18.211.24.19 80]
Err:9 http://http.kali.org/kali kali-rolling/main amd64 libgtk2.0-common all 2.24.33-2
404 Not Found [IP: 18.211.24.19 80]
Err:10 http://http.kali.org/kali kali-rolling/main amd64 libgtk2.0-0 amd64 2.24.33-2
404 Not Found [IP: 18.211.24.19 80]
Err:11 http://http.kali.org/kali kali-rolling/main amd64 libxml2 amd64 2.9.10+dfsg-6.7
404 Not Found [IP: 18.211.24.19 80]
Err:12 http://http.kali.org/kali kali-rolling/main amd64 libxml2-utils amd64 2.9.10+dfsg-6.7
404 Not Found [IP: 18.211.24.19 80]
Err:13 http://http.kali.org/kali kali-rolling/main amd64 metasploit-framework amd64 6.0.46-0kali1
404 Not Found [IP: 18.211.24.19 80]
Err:14 http://http.kali.org/kali kali-rolling/main amd64 mimikatz all 2.2.0-git20210525-0kali1
404 Not Found [IP: 18.211.24.19 80]
Err:15 http://http.kali.org/kali kali-rolling/main amd64 python3-impacket all 0.9.22-2
404 Not Found [IP: 18.211.24.19 80]
Err:16 http://http.kali.org/kali kali-rolling/main amd64 starkiller amd64 1.7.0-Kali-0kali3
404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/f/freerdp2/freerdp2-x11_2.3.0+dfsg1-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/f/freerdp2/libfreerdp-client2-2_2.3.0+dfsg1-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/f/freerdp2/libfreerdp2-2_2.3.0+dfsg1-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/f/freerdp2/libwinpr2-2_2.3.0+dfsg1-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/libx/libx11/libx11-xcb1_1.7.1-1_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/libx/libx11/libx11-data_1.7.1-1_all.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/libx/libx11/libx11-6_1.7.1-1_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/g/gtk+2.0/gtk2-engines-pixbuf_2.24.33-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/g/gtk+2.0/libgtk2.0-common_2.24.33-2_all.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/g/gtk+2.0/libgtk2.0-0_2.24.33-2_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/libx/libxml2/libxml2_2.9.10+dfsg-6.7_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/libx/libxml2/libxml2-utils_2.9.10+dfsg-6.7_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/m/metasploit-framework/metasploit-framework_6.0.46-0kali1_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/m/mimikatz/mimikatz_2.2.0-git20210525-0kali1_all.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/i/impacket/python3-impacket_0.9.22-2_all.deb 404 Not Found [IP: 18.211.24.19 80]
E: Failed to fetch http://http.kali.org/kali/pool/main/s/starkiller/starkiller_1.7.0-Kali-0kali3_amd64.deb 404 Not Found [IP: 18.211.24.19 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?