Ответ 1
Надеюсь, что это поможет кому-то еще, я, наконец, смог решить проблему, вручную обновив некоторые угловые пакеты (используя npm)
npm i @angular/[email protected] @angular/[email protected] @angular/[email protected] [email protected] --save
После этого команда ng update может работать (с некоторыми предупреждениями, но, по крайней мере, мы передали ng update @angular/core)
ng update @angular/core
Updating package.json with dependency @angular/language-service @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/animations @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/forms @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/common @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/compiler @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/core @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/router @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/platform-browser-dynamic @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/platform-browser @ "6.0.3" (was "5.2.10")...
Updating package.json with dependency @angular/http @ "6.0.3" (was "5.2.10")...
UPDATE package.json (1587 bytes)
npm WARN @angular/[email protected] requires a peer of [email protected]>=2.7.2 <2.8 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected]^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected]^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected]^5.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of [email protected]^5.5.0 but none is installed. You must install peer dependencies yourself.
npm WARN @ngtools/[email protected] requires a peer of [email protected]~2.4.0 || ~2.5.0 || ~2.6.0 || ~2.7.0 but none is installed. You must install peer dependencies yourself.
npm WARN @ngx-translate/[email protected] requires a peer of @ngx-translate/[email protected]>=10.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of [email protected]>=2.4.2 <2.8 but none is installed. You must install peer dependencies yourself.
updated 10 packages in 57.253s