How to disable specific Mirror repository?

Question

I'm trying to install updates. But apt always using ftp.harukasan.org. This mirror is too slow. I need to change. I checked /etc/apt/sources.list, /etc/apt/sources.list.d/ there is no configuration is used ftp.harukasan.org.

Edit: apt output

pi@raspberrypi:~ $ sudo apt update
Get:1 http://archive.raspberrypi.org/debian buster InRelease [25.2 kB]
Get:2 http://raspbian.raspberrypi.org/raspbian buster InRelease [15.0 kB]
Get:3 http://archive.raspberrypi.org/debian buster/main armhf Packages [259 kB]
Get:4 http://raspbian.raspberrypi.org/raspbian buster/main armhf Packages [13.0 MB]

pi@raspberrypi:~ $ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  point-rpi
Use 'sudo apt autoremove' to remove it.
The following NEW packages will be installed:
  bubblewrap eject xdg-dbus-proxy
The following packages will be upgraded:
  arandr base-files cron dhcpcd5 distro-info-data e2fsprogs file firmware-atheros firmware-brcm80211 firmware-libertas firmware-misc-nonfree
  firmware-realtek freetype2-doc gldriver-test gtk2-engines-pixflat libarchive13 libcom-err2 libext2fs2 libfm-data libfm-extra4 libfm-gtk-data
  libfm-gtk4 libfm-modules libfm4 libfreetype6 libfreetype6-dev libfribidi0 libglib2.0-0 libglib2.0-bin libglib2.0-data libgs9 libgs9-common
  libjavascriptcoregtk-4.0-18 libmagic-mgc libmagic1 libmp3lame0 libmtdev1 libncurses6 libncursesw5 libncursesw6 libobrender32v5 libobt2v5 libogg0
  libpam-systemd libpython2.7 libpython2.7-dev libpython2.7-minimal libpython2.7-stdlib libraw1394-11 libsord-0-0 libspeex1 libspeexdsp1 libss2
  libssl1.1 libsystemd0 libtinfo5 libtinfo6 libudev1 libwebkit2gtk-4.0-37 libxaw7 libxcb-util0 libxdamage1 libxml2 libxmu6 libxmuu1 libxslt1.1
  libxt6 lxpanel lxpanel-data lxplug-bluetooth lxplug-ejecter lxplug-ptbatt lxplug-volume ncurses-base ncurses-bin ncurses-term obconf openbox
  openssh-client openssh-server openssh-sftp-server openssl pcmanfm pi-bluetooth piclone pipanel piwiz python-cryptography python-piglow
  python-werkzeug python2.7 python2.7-dev python2.7-minimal python3-cryptography python3-piglow python3-werkzeug raspberrypi-kernel
  raspberrypi-sys-mods raspberrypi-ui-mods raspi-config raspi-gpio rc-gui rp-prefapps rpcbind rpi-chromium-mods rpi-eeprom rpi-eeprom-images ssh
  sudo systemd systemd-sysv udev wpasupplicant
113 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 177 MB of archives.
After this operation, 3628 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://archive.raspberrypi.org/debian buster/main armhf rpi-chromium-mods armhf 20191118 [9189 kB]
Get:2 http://ftp.harukasan.org/raspbian/raspbian buster/main armhf base-files armhf 10.3+rpi1+deb10u2 [70.0 kB]
Get:3 http://ftp.harukasan.org/raspbian/raspbian buster/main armhf ncurses-bin armhf 6.1+20181013-2+deb10u2 [400 kB]
Get:4 http://ftp.harukasan.org/raspbian/raspbian buster/main armhf ncurses-base all 6.1+20181013-2+deb10u2 [258 kB]
Get:5 http://ftp.harukasan.org/raspbian/raspbian buster/main armhf libsystemd0 armhf 241-7~deb10u2+rpi1 [304 kB]
Get:15 http://archive.raspberrypi.org/debian buster/main armhf arandr all 0.1.9-2+rpt10 [65.6 kB]

sources.list

deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi

sources.list.d/raspbi.list

deb http://archive.raspberrypi.org/debian/ buster main
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://archive.raspberrypi.org/debian/ buster main

Answer 1

You have provided no evidence of any problem.
I know of no way of blocking a mirror, but you can change the mirror used.

Select a mirror from https://www.raspbian.org/RaspbianMirrors/

Then edit /etc/apt/sources.list substituting a local mirror for http://raspbian.raspberrypi.org/raspbian/

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A more verbose set of instructions are in https://pimylifeup.com/raspbian-repository-mirror/ (but the end result is the same)

Answer 2

ftp.harukasan.org is selected by the Raspbian mirror redirector (raspbian.raspberrypi.org, which is not a "real" mirror server).

To speed up, you can specify the nearest mirror server in /etc/apt/sources.list, by replacing the raspbian.raspberrypi.org to the nearest server's "real" address.

The nearest server could be found here:

• http://raspbian.raspberrypi.org/raspbian/pool/main/r/raspbian-archive-keyring/raspbian-archive-keyring_20120528.2_all.deb.mirrorlist

Full list is also available here (but contains a lot of inactive servers):

• https://www.raspbian.org/RaspbianMirrors

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Unfortunately, https://ftp.harukasan.org is for domestic (South Korea) and could be very slow for overseas users. Apologise for your inconvenience.

If you want to report any issue with https://ftp.harukasan.org, please feel free to send us a mail: harukasan-ftp@lists.launchpad.net; or DM @harukasan_ftp in Twitter.