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+Setting up tzdata (2018d-1) ...\r
+debconf: unable to initialize frontend: Dialog\r
+debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)\r
+debconf: falling back to frontend: Readline\r
+Configuring tzdata\r
+------------------\r
+\r
+Please select the geographic area in which you live. Subsequent configuration\r
+questions will narrow this down by presenting a list of cities, representing\r
+the time zones in which they are located.\r
+\r
+  1. Africa      4. Australia  7. Atlantic  10. Pacific  13. Etc\r
+  2. America     5. Arctic     8. Europe    11. SystemV\r
+  3. Antarctica  6. Asia       9. Indian    12. US\r
+Geographic area: 8\r

diff --git a/solution.txt b/solution.txt
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++++ docker/web-build/Dockerfile\r
+@@ -1,9 +1,10 @@\r
+-FROM ubuntu:16.04\r
++FROM ubuntu:18.04\r
+ \r
+ MAINTAINER "Christian Weiske" <weiske@mogic.com>\r
+ \r
+ ENV TERM=xterm\\r
+-    TZ=Europe/Berlin\r
++    TZ=Europe/Berlin\\r
++    DEBIAN_FRONTEND=noninteractive\r