You can try this once. Copy and paste the following line into the file. Acquire::ForceIPv4 "true"; Save and close the file. From now on, APT will use IPv4 only.
[COLOR=#ffffff][SIZE=7pt][URL=https://www.upsers.app][COLOR=#ffffff]Upsers[/COLOR][/URL][/SIZE][/COLOR][COLOR=#ffffff][SIZE=7pt][URL=https://www.upsers.app][COLOR=#ffffff][/COLOR][/URL][COLOR=#ffffff][/COLOR][/SIZE][/COLOR]
[COLOR=#ffffff][SIZE=7pt][URL=https://www.upsers.app][COLOR=#ffffff]Upsers[/COLOR][/URL][/SIZE][/COLOR][COLOR=#ffffff][SIZE=7pt][URL=https://www.upsers.app][COLOR=#ffffff][/COLOR][/URL][COLOR=#ffffff][/COLOR][/SIZE][/COLOR]