diff --git a/README.md b/README.md
index 144ddec2..a039fa5a 100644
--- a/README.md
+++ b/README.md
@@ -139,12 +139,12 @@ If the `path:` value doesn't match the name of the repository, a `MODULE_NOT_FOU
 
 GitHub Actions offers managed [virtual environments](https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners) for running workflows. In order for `act` to run your workflows locally, it must run a container for the runner defined in your workflow file. Here are the images that `act` uses for each runner type and size:
 
-| GitHub Runner  | Micro Docker Image                 | Medium Docker Image                      | Large Docker Image                            |
-| -------------- | ---------------------------------- | ---------------------------------------- | --------------------------------------------- |
-| ubuntu-latest  | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-latest][medium] | [nektos/act-environments-ubuntu:18.04][large] |
-| ubuntu-20.04   | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-20.04][medium]  | `unavailable`                                 |
-| ubuntu-18.04   | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-18.04][medium]  | [nektos/act-environments-ubuntu:18.04][large] |
-| ubuntu-16.04   | [node:12.20.1-stretch-slim][micro] | [catthehacker/ubuntu:act-16.04][medium]  | `unavailable`                                 |
+| GitHub Runner | Micro Docker Image                 | Medium Docker Image                      | Large Docker Image                            |
+| ------------- | ---------------------------------- | ---------------------------------------- | --------------------------------------------- |
+| ubuntu-latest | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-latest][medium] | `unavailable`                                 |
+| ubuntu-20.04  | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-20.04][medium]  | `unavailable`                                 |
+| ubuntu-18.04  | [node:12.20.1-buster-slim][micro]  | [catthehacker/ubuntu:act-18.04][medium]  | [nektos/act-environments-ubuntu:18.04][large] |
+| ubuntu-16.04  | [node:12.20.1-stretch-slim][micro] | [catthehacker/ubuntu:act-16.04][medium]  | `unavailable`                                 |
 
 Below platforms are currently **unsupported and won't work** (see issue [#97])
 
diff --git a/cmd/root.go b/cmd/root.go
index dc3073e5..d69790fa 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -205,7 +205,7 @@ func newRunCommand(ctx context.Context, input *Input) func(*cobra.Command, []str
 			if os.IsNotExist(err) {
 				var answer string
 				confirmation := &survey.Select{
-					Message: "Please choose the default image you want to use with act:\n\n  - Large size image: +20GB Docker image, includes almost all tools used on GitHub Actions (only ubuntu-latest/ubuntu-18.04 platform is available)\n  - Medium size image: ~500MB, includes only necessary tools to bootstrap actions and aims to be compatible with all actions\n  - Micro size image: <200MB, contains only NodeJS required to bootstrap actions, doesn't work with all actions\n\nDefault image and other options can be changed manually in ~/.actrc (please refer to https://github.com/nektos/act#configuration for additional information about file structure)",
+					Message: "Please choose the default image you want to use with act:\n\n  - Large size image: +20GB Docker image, includes almost all tools used on GitHub Actions (IMPORTANT: currently only ubuntu-18.04 platform is available)\n  - Medium size image: ~500MB, includes only necessary tools to bootstrap actions and aims to be compatible with all actions\n  - Micro size image: <200MB, contains only NodeJS required to bootstrap actions, doesn't work with all actions\n\nDefault image and other options can be changed manually in ~/.actrc (please refer to https://github.com/nektos/act#configuration for additional information about file structure)",
 					Help:    "If you want to know why act asks you that, please go to https://github.com/nektos/act/issues/107",
 					Default: "Medium",
 					Options: []string{"Large", "Medium", "Micro"},
@@ -219,7 +219,7 @@ func newRunCommand(ctx context.Context, input *Input) func(*cobra.Command, []str
 				var option string
 				switch answer {
 				case "Large":
-					option = "-P ubuntu-latest=nektos/act-environments-ubuntu:18.04\n-P ubuntu-18.04=nektos/act-environments-ubuntu:18.04"
+					option = "-P ubuntu-18.04=nektos/act-environments-ubuntu:18.04"
 				case "Medium":
 					option = "-P ubuntu-latest=catthehacker/ubuntu:act-latest\n-P ubuntu-20.04=catthehacker/ubuntu:act-20.04\n-P ubuntu-18.04=catthehacker/ubuntu:act-18.04\nubuntu-16.04=catthehacker/ubuntu:act-16.04"
 				case "Micro":