diff --git a/app/src/api/errors.js b/app/src/api/errors.js
index cbca7c12..f120ac02 100644
--- a/app/src/api/errors.js
+++ b/app/src/api/errors.js
@@ -47,6 +47,7 @@ class APIBadRequestError extends APIError {
   constructor (method, response, errorData) {
     super(method, response, errorData)
     this.name = 'APIBadRequestError'
+    this.key = errorData.error_key
   }
 }
 
diff --git a/app/src/components/globals/CardForm.vue b/app/src/components/globals/CardForm.vue
index 1867f4bd..8debb8a3 100644
--- a/app/src/components/globals/CardForm.vue
+++ b/app/src/components/globals/CardForm.vue
@@ -10,7 +10,10 @@
         <slot name="default" />
 
         <slot name="server-error">
-          <b-alert variant="danger" :show="serverError !== ''" v-html="serverError" />
+          <b-alert
+            variant="danger" class="my-3"
+            :show="serverError !== ''" v-html="serverError"
+          />
         </slot>
       </b-form>
     </template>
diff --git a/app/src/i18n/locales/en.json b/app/src/i18n/locales/en.json
index 71f20d8a..4e192826 100644
--- a/app/src/i18n/locales/en.json
+++ b/app/src/i18n/locales/en.json
@@ -314,6 +314,9 @@
     "permission_show_tile_enabled": "Visible as tile in user portal",
     "port": "Port",
     "ports": "Ports",
+    "postinstall": {
+        "force": "Force the post-install"
+    },
     "postinstall_domain": "This is the first domain name linked to your YunoHost server, but also the one which will be used by your server's users to access the authentication portal. Accordingly, it will be visible by everyone, so choose it carefully.",
     "postinstall_intro_1": "Congratulations! YunoHost has been successfully installed.",
     "postinstall_intro_2": "Two more configuration steps are required to activate you server's services.",
diff --git a/app/src/views/PostInstall.vue b/app/src/views/PostInstall.vue
index 4682e30a..4a55c906 100644
--- a/app/src/views/PostInstall.vue
+++ b/app/src/views/PostInstall.vue
@@ -12,37 +12,57 @@
         <span v-html="$t('postinstall_intro_3')" />
       </p>
 
-      <b-button size="lg" variant="primary" @click="step = 'domain'">
+      <b-button size="lg" variant="primary" @click="goToStep('domain')">
         {{ $t('begin') }}
       </b-button>
     </template>
 
     <!-- DOMAIN SETUP STEP -->
     <template v-else-if="step === 'domain'">
-      <domain-form @submit="setDomain" :title="$t('postinstall_set_domain')" :submit-text="$t('next')">
+      <domain-form
+        :title="$t('postinstall_set_domain')" :submit-text="$t('next')" :server-error="serverError"
+        @submit="setDomain"
+      >
         <template #disclaimer>
           <p class="alert alert-info" v-t="'postinstall_domain'" />
         </template>
       </domain-form>
 
-      <b-button variant="primary" @click="step = 'start'" class="mt-3">
+      <b-button variant="primary" @click="goToStep('start')" class="mt-3">
         <icon iname="chevron-left" /> {{ $t('previous') }}
       </b-button>
     </template>
 
     <!-- PASSWORD SETUP STEP -->
     <template v-else-if="step === 'password'">
-      <password-form :title="$t('postinstall_set_password')" :submit-text="$t('next')" @submit="setPassword">
+      <password-form
+        :title="$t('postinstall_set_password')" :submit-text="$t('next')" :server-error="serverError"
+        @submit="setPassword"
+      >
         <template #disclaimer>
           <p class="alert alert-warning" v-t="'postinstall_password'" />
         </template>
       </password-form>
 
-      <b-button variant="primary" @click="step = 'domain'" class="mt-3">
+      <b-button variant="primary" @click="goToStep('domain')" class="mt-3">
         <icon iname="chevron-left" /> {{ $t('previous') }}
       </b-button>
     </template>
 
+    <template v-else-if="step === 'rootfsspace-error'">
+      <card no-body header-class="d-none" footer-bg-variant="danger">
+        <b-card-body class="alert alert-danger m-0">
+          {{ serverError }}
+        </b-card-body>
+
+        <template #buttons>
+          <b-button variant="light" size="sm" @click="performPostInstall(true)">
+            <icon iname="warning" /> {{ $t('postinstall.force') }}
+          </b-button>
+        </template>
+      </card>
+    </template>
+
     <!-- POST-INSTALL SUCCESS STEP -->
     <template v-else-if="step === 'login'">
       <p class="alert alert-success">
@@ -71,14 +91,20 @@ export default {
     return {
       step: 'start',
       domain: undefined,
-      password: undefined
+      password: undefined,
+      serverError: ''
     }
   },
 
   methods: {
+    goToStep (step) {
+      this.serverError = ''
+      this.step = step
+    },
+
     setDomain ({ domain }) {
       this.domain = domain
-      this.step = 'password'
+      this.goToStep('password')
     },
 
     async setPassword ({ password }) {
@@ -90,11 +116,23 @@ export default {
       this.performPostInstall()
     },
 
-    performPostInstall () {
+    performPostInstall (force = false) {
       // FIXME does the api will throw an error for bad passwords ?
-      api.post('postinstall', { domain: this.domain, password: this.password }).then(data => {
+      api.post('postinstall' + (force ? '?force_diskspace' : ''), { domain: this.domain, password: this.password }).then(data => {
         // Display success message and allow the user to login
-        this.step = 'login'
+        this.goToStep('login')
+      }).catch(err => {
+        if (err.name !== 'APIBadRequestError') throw err
+        if (err.key === 'postinstall_low_rootfsspace') {
+          this.step = 'rootfsspace-error'
+        } else if (err.key.includes('password')) {
+          this.step = 'password'
+        } else if (['domain', 'dyndns'].some(word => err.key.includes(word))) {
+          this.step = 'domain'
+        } else {
+          throw err
+        }
+        this.serverError = err.message
       })
     }
   },