(I've examined the seemingly similar questions I can find and get to know it's not a duplicate..
Error message:
Err:1 https://download.mono-project.com/repo/ubuntu stable-bionic/main amd64 libmono-corlib4.5-cil all 6.12.0.122-0xamarin1+ubuntu1804b1
504 Gateway Timeout [IP: 117.18.232.200 443]
Get:2 https://download.mono-project.com/repo/ubuntu stable-bionic/main amd64 libmono-system-servicemodel-routing4.0-cil all 6.12.0.122-0xamarin1+ubuntu1804b1 [41.6 kB]
Fetched 41.6 kB in 16s (2,555 B/s)
E: Failed to fetch https://download.mono-project.com/repo/ubuntu/pool/main/m/mono/libmono-corlib4.5-cil_6.12.0.122-0xamarin1+ubuntu1804b1_all.deb 504 Gateway Timeout [IP: 117.18.232.200 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Following operations have been attempted and none of them work.
apt-get update
- follow the mono download instructions for Ubuntu 18.04:
sudo apt install gnupg ca-certificates
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
- `echo "deb https://download.mono-project.com/repo/ubuntu stable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
- update index
- install again with
fix-missing
.
OS info:
> uname -a
Linux **** 5.4.0-87-generic #98~18.04.1-Ubuntu SMP Wed Sep 22 10:45:04 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
EIDT: I can directly fetch the timeout deb package from the url, but when installing, it said:
dpkg: dependency problems prevent configuration of libmono-system-servicemodel-routing4.0-cil:
libmono-system-servicemodel-routing4.0-cil depends on libmono-corlib4.5-cil (>= 4.0.0~alpha1); however:
Package libmono-corlib4.5-cil is not installed.
libmono-system-servicemodel-routing4.0-cil depends on libmono-system-configuration4.0-cil (>= 4.0.0~alpha1); however:
Package libmono-system-configuration4.0-cil is not installed.
libmono-system-servicemodel-routing4.0-cil depends on libmono-system-runtime-serialization4.0-cil (>= 4.0.0~alpha1); however:
Package libmono-system-runtime-serialization4.0-cil is not installed.
libmono-system-servicemodel-routing4.0-cil depends on libmono-system-servicemodel4.0a-cil (>= 3.2.3); however:
Package libmono-system-servicemodel4.0a-cil is not installed.
libmono-system-servicemodel-routing4.0-cil depends on libmono-system4.0-cil (>= 4.0.0~alpha1); however:
Package libmono-system4.0-cil is not installed.
dpkg: error processing package libmono-system-servicemodel-routing4.0-cil (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
libmono-system-servicemodel-routing4.0-cil