install fails

[OM-3kChcBjgFR2COfP]

Ign:4 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libgdk-pixbuf2.0-common all 2.42.2+dfsg-1+deb11u1
Get:11 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libgdk-pixbuf-2.0-0 arm64 2.42.2+dfsg-1+deb11u1 [136 kB]
Get:29 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 gir1.2-gdkpixbuf-2.0 arm64 2.42.2+dfsg-1+deb11u1 [19.9 kB]
Err:84 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libgtk-3-common all 3.24.24-4+deb11u3
404 Not Found [IP: 101.6.15.130 80]
Err:103 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libavutil56 arm64 7:4.3.6-0+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:115 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libswresample3 arm64 7:4.3.6-0+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:121 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libvpx6 arm64 1.9.0-1+deb11u2
404 Not Found [IP: 101.6.15.130 80]
Err:130 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libavcodec58 arm64 7:4.3.6-0+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:145 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libavformat58 arm64 7:4.3.6-0+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:194 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libgstreamer-plugins-base1.0-0 arm64 1.18.4-2+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:220 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libswscale5 arm64 7:4.3.6-0+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Err:232 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 python3-pil arm64 8.1.2+dfsg-0.3+deb11u1
404 Not Found [IP: 101.6.15.130 80]
Get:4 http://mirrors.tuna.tsinghua.edu.cn/debian bullseye/main arm64 libgdk-pixbuf2.0-common all 2.42.2+dfsg-1+deb11u1 [320 kB]
Fetched 113 MB in 46s (2,429 kB/s)
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/g/gtk%2b3.0/gtk-update-icon-cache_3.24.24-4%2bdeb11u3_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/c/cups/libcups2_2.3.3op2-3%2bdeb11u6_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/g/gtk%2b3.0/libgtk-3-common_3.24.24-4%2bdeb11u3_all.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/g/gtk%2b3.0/libgtk-3-0_3.24.24-4%2bdeb11u3_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/g/gtk%2b3.0/gir1.2-gtk-3.0_3.24.24-4%2bdeb11u3_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/f/ffmpeg/libavutil56_4.3.6-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian/pool/main/d/dav1d/libdav1d4_0.7.1-3_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/f/ffmpeg/libswresample3_4.3.6-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/libv/libvpx/libvpx6_1.9.0-1%2bdeb11u2_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/f/ffmpeg/libavcodec58_4.3.6-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/f/ffmpeg/libavformat58_4.3.6-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/p/postgresql-13/libpq5_13.14-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/g/gst-plugins-base1.0/libgstreamer-plugins-base1.0-0_1.18.4-2%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/f/ffmpeg/libswscale5_4.3.6-0%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Failed to fetch http://mirrors.tuna.tsinghua.edu.cn/debian-security/pool/updates/main/p/pillow/python3-pil_8.1.2%2bdfsg-0.3%2bdeb11u1_arm64.deb 404 Not Found [IP: 101.6.15.130 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

what can i do? Thanks

[DoctorDemon]

It seems as if you tried to update your system packages using

apt-get update && apt-get upgrade

but many of the sources don’t seem to be available.

Could you provide more information on what you were trying to do and what commands you ran?

[OM-3kChcBjgFR2COfP]

It seems as if you tried to update your system packages using

apt-get update && apt-get upgrade

but many of the sources don’t seem to be available.

Could you provide more information on what you were trying to do and what commands you ran?

No, these are the last steps of the installation: apt-get install opendrop

[DoctorDemon]

I think there is nothing we can do, because the owners of the server the apt command is trying to reach does not host the required files anymore.
Maybe you can find the sources manually and install them "by hand"?