root@orangepizero:/root#apt upgrade WARNING: apt does not have a stable CLI interface. Use with caution in scripts. Reading package lists... Building dependency tree... Reading state information... Calculating upgrade... The following packages will be upgraded: linux-libc-dev 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 809 kB of archives. After this operation, 4,096 B of additional disk space will be used. Do you want to continue? [Y/n] y Err:1 http://ports.ubuntu.com xenial-updates/main armhf linux-libc-dev armhf 4.4.0-62.83 404 Not Found [IP: 91.189.88.150 80] Err:1 http://ports.ubuntu.com xenial-updates/main armhf linux-libc-dev armhf 4.4.0-62.83 404 Not Found [IP: 91.189.88.150 80] E: Failed to fetch http://ports.ubuntu.com/pool/main/l/linux/linux-libc-dev_4.4.0-62.83_armhf.deb 404 Not Found [IP: 91.189.88.150 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? root@orangepizero:/root#apt-get upgrade Reading package lists... Building dependency tree... Reading state information... Calculating upgrade... The following packages will be upgraded: linux-libc-dev 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 809 kB of archives. After this operation, 4,096 B of additional disk space will be used. Do you want to continue? [Y/n] y Err:1 http://ports.ubuntu.com xenial-updates/main armhf linux-libc-dev armhf 4.4.0-62.83 404 Not Found [IP: 91.189.88.150 80] Err:1 http://ports.ubuntu.com xenial-updates/main armhf linux-libc-dev armhf 4.4.0-62.83 404 Not Found [IP: 91.189.88.150 80] E: Failed to fetch http://ports.ubuntu.com/pool/main/l/linux/linux-libc-dev_4.4.0-62.83_armhf.deb 404 Not Found [IP: 91.189.88.150 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? root@orangepizero:/root#